Stop to use the __future__ module.

The __future__ module [1] was used in this context to ensure compatibility
between python 2 and python 3.

We previously dropped the support of python 2.7 [2] and now we only support
python 3 so we don't need to continue to use this module and the imports
listed below.

Imports commonly used and their related PEPs:
- `division` is related to PEP 238 [3]
- `print_function` is related to PEP 3105 [4]
- `unicode_literals` is related to PEP 3112 [5]
- `with_statement` is related to PEP 343 [6]
- `absolute_import` is related to PEP 328 [7]

[1] https://docs.python.org/3/library/__future__.html
[2] https://governance.openstack.org/tc/goals/selected/ussuri/drop-py27.html
[3] https://www.python.org/dev/peps/pep-0238
[4] https://www.python.org/dev/peps/pep-3105
[5] https://www.python.org/dev/peps/pep-3112
[6] https://www.python.org/dev/peps/pep-0343
[7] https://www.python.org/dev/peps/pep-0328

Change-Id: I2f9d4c9a760bd9a9dbb9cde5bcb8af24fd4b34b9

openstack_election/check_candidacy.py

@@ -10,10 +10,6 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-from __future__ import absolute_import
-from __future__ import print_function
-from __future__ import unicode_literals
-
 import datetime
 import os
 

openstack_election/cmds/change_owners.py

@@ -85,11 +85,6 @@
 #     Owners of at least 4 changes: 1682
 #     Owners of at least 5 changes: 1504
 
-
-from __future__ import absolute_import
-from __future__ import print_function
-from __future__ import unicode_literals
-
 import argparse
 import sys
 

openstack_election/cmds/check_all_candidacies.py

@@ -10,10 +10,6 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-from __future__ import absolute_import
-from __future__ import print_function
-from __future__ import unicode_literals
-
 import argparse
 import input
 import os

openstack_election/cmds/check_candidacy.py

@@ -10,10 +10,6 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-from __future__ import absolute_import
-from __future__ import print_function
-from __future__ import unicode_literals
-
 import argparse
 
 from openstack_election import check_candidacy

openstack_election/cmds/check_manual.py

@@ -10,10 +10,6 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-from __future__ import absolute_import
-from __future__ import print_function
-from __future__ import unicode_literals
-
 import argparse
 
 from openstack_election import check_candidacy

openstack_election/cmds/ci_check_all_candidate_files.py

@@ -10,10 +10,6 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-from __future__ import absolute_import
-from __future__ import print_function
-from __future__ import unicode_literals
-
 import argparse
 import os
 import subprocess

openstack_election/cmds/close_election.py

@@ -10,10 +10,6 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-from __future__ import absolute_import
-from __future__ import print_function
-from __future__ import unicode_literals
-
 import argparse
 import os
 import yaml

openstack_election/cmds/create_directories.py

@@ -10,10 +10,6 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-from __future__ import absolute_import
-from __future__ import print_function
-from __future__ import unicode_literals
-
 import os
 
 from openstack_election import utils

openstack_election/cmds/generate_rolls.py

@@ -10,10 +10,6 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-from __future__ import absolute_import
-from __future__ import print_function
-from __future__ import unicode_literals
-
 import argparse
 import glob
 import hashlib

openstack_election/cmds/render_statistics.py

@@ -10,10 +10,6 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-from __future__ import absolute_import
-from __future__ import print_function
-from __future__ import unicode_literals
-
 import argparse
 import datetime
 import os

openstack_election/cmds/search_rolls.py

@@ -10,10 +10,6 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-from __future__ import absolute_import
-from __future__ import print_function
-from __future__ import unicode_literals
-
 import argparse
 
 import os

openstack_election/cmds/setup_election_config.py

@@ -10,10 +10,6 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-from __future__ import absolute_import
-from __future__ import print_function
-from __future__ import unicode_literals
-
 import argparse
 import datetime
 import pytz

openstack_election/cmds/template_emails.py

@@ -1,5 +1,3 @@
-from __future__ import print_function
-from __future__ import unicode_literals
 
 import argparse
 import jinja2

openstack_election/cmds/update_governance.py

@@ -10,10 +10,6 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-from __future__ import absolute_import
-from __future__ import print_function
-from __future__ import unicode_literals
-
 import argparse
 import os
 import re

openstack_election/exception.py

@@ -10,10 +10,6 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-from __future__ import absolute_import
-from __future__ import print_function
-from __future__ import unicode_literals
-
 
 class ElectionException(Exception):
     """Base Election Exception

openstack_election/owners.py

@@ -17,8 +17,6 @@
 # counts for each governance project-team, as well as a combined set
 # for all teams.
 
-from __future__ import print_function
-
 import csv
 import datetime
 import os

openstack_election/require_py3.py

@@ -10,10 +10,6 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-from __future__ import absolute_import
-from __future__ import print_function
-from __future__ import unicode_literals
-
 import sys
 
 if sys.version_info.major < 3:

openstack_election/tests/base.py

@@ -10,10 +10,6 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-from __future__ import absolute_import
-from __future__ import print_function
-from __future__ import unicode_literals
-
 import testtools
 
 from openstack_election.tests import fixtures as election_fixtures

openstack_election/tests/cmds/test_ci_checks.py

@@ -10,10 +10,6 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-from __future__ import absolute_import
-from __future__ import print_function
-from __future__ import unicode_literals
-
 import mock
 
 from openstack_election.cmds import ci_check_all_candidate_files

openstack_election/tests/fixtures.py

@@ -10,10 +10,6 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-from __future__ import absolute_import
-from __future__ import print_function
-from __future__ import unicode_literals
-
 import fixtures
 import os
 

openstack_election/tests/test_utils.py

@@ -10,10 +10,6 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-from __future__ import absolute_import
-from __future__ import print_function
-from __future__ import unicode_literals
-
 import mock
 
 from openstack_election import exception

openstack_election/utils.py

@@ -10,10 +10,6 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-from __future__ import absolute_import
-from __future__ import print_function
-from __future__ import unicode_literals
-
 import datetime
 import json
 import os

tools/ptl-election-summary.py

@@ -12,9 +12,6 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-from __future__ import division
-from __future__ import print_function
-
 import glob
 import os
 import prettytable

tools/tc-election-summary.py

@@ -12,9 +12,6 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-from __future__ import division
-from __future__ import print_function
-
 import prettytable
 
 CIVS_BASE = 'https://civs.cs.cornell.edu/cgi-bin/results.pl'