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: I73b532283079d346b75a925e2aee707c4de8fa9e

tools/install_venv_common.py

@@ -22,8 +22,6 @@ environment, it should be kept strictly compatible with Python 2.6.
 Synced in from openstack-common
 """
 
-from __future__ import print_function
-
 import optparse
 import os
 import subprocess

troveclient/client.py

@@ -19,8 +19,6 @@
 OpenStack Client interface. Handles the REST calls and responses.
 """
 
-from __future__ import print_function
-
 import logging
 
 from keystoneauth1 import adapter

troveclient/compat/auth.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 six
 from troveclient.compat import exceptions
 

troveclient/osc/v1/database_logs.py

@@ -10,8 +10,6 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from __future__ import print_function
-
 from osc_lib.command import command
 from osc_lib import utils as osc_utils
 import six

troveclient/shell.py

@@ -18,8 +18,6 @@
 Command-line interface to the OpenStack Trove API.
 """
 
-from __future__ import print_function
-
 import argparse
 import getpass
 import glob

troveclient/utils.py

@@ -14,8 +14,6 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from __future__ import print_function
-
 import base64
 import os
 import simplejson as json

troveclient/v1/shell.py

@@ -14,8 +14,6 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from __future__ import print_function
-
 import argparse
 import sys
 import time