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: I88a05dfd99fbca043f25b5ddce7663467699e69b

zaqar/bench/conductor.py

@@ -12,8 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from __future__ import print_function
-
 import json
 import multiprocessing as mp
 import os

zaqar/bench/consumer.py

@@ -12,9 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from __future__ import division
-from __future__ import print_function
-
 import multiprocessing as mp
 import random
 import sys

zaqar/bench/observer.py

@@ -12,9 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from __future__ import division
-from __future__ import print_function
-
 import multiprocessing as mp
 import random
 import sys

zaqar/bench/producer.py

@@ -12,9 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from __future__ import division
-from __future__ import print_function
-
 import json
 import multiprocessing as mp
 import random

zaqar/common/cli.py

@@ -11,8 +11,6 @@
 # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 # License for the specific language governing permissions and limitations under
 # the License.
-
-from __future__ import print_function
 import functools
 import sys
 

zaqar/storage/mongodb/utils.py

@@ -12,8 +12,6 @@
 # implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-
-from __future__ import division
 import binascii
 import collections
 import datetime

zaqar/storage/sqlalchemy/migration/alembic_migrations/env.py

@@ -14,8 +14,6 @@
 # limitations under the License.
 #
 # Based on Neutron's migration/cli.py
-
-from __future__ import with_statement
 from logging import config as c
 
 from alembic import context

zaqar/tests/functional/wsgi/v1/test_messages.py

@@ -13,8 +13,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from __future__ import division
-
 import json
 import uuid
 

zaqar/tests/functional/wsgi/v1_1/test_messages.py

@@ -13,8 +13,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from __future__ import division
-
 import json
 import uuid
 

zaqar/tests/functional/wsgi/v2/test_subscriptions.py

@@ -13,8 +13,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from __future__ import division
-
 import time
 import uuid