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 and now we only support
python 3 so we don't need to continue to use this module and the imports
listed below.

Change-Id: I19fbdebe406575d2567f98a322ff68e6e992fac7

tripleoclient/heat_launcher.py

@@ -12,7 +12,6 @@
 #   License for the specific language governing permissions and limitations
 #   under the License.
 #
-from __future__ import print_function
 
 import datetime
 import grp

tripleoclient/utils.py

@@ -13,7 +13,6 @@
 #   under the License.
 #
 
-from __future__ import print_function
 import collections
 
 try:

tripleoclient/v1/overcloud_cell.py

@@ -10,8 +10,6 @@
 #   License for the specific language governing permissions and limitations
 #   under the License.
 
-from __future__ import print_function
-
 from datetime import datetime
 import logging
 import os.path

tripleoclient/v1/overcloud_deploy.py

@@ -12,7 +12,6 @@
 #   License for the specific language governing permissions and limitations
 #   under the License.
 #
-from __future__ import print_function
 
 import argparse
 import logging

tripleoclient/v1/overcloud_export.py

@@ -10,8 +10,6 @@
 #   License for the specific language governing permissions and limitations
 #   under the License.
 
-from __future__ import print_function
-
 from datetime import datetime
 import logging
 import os.path

tripleoclient/v1/overcloud_image.py

@@ -13,8 +13,6 @@
 #   under the License.
 #
 
-from __future__ import print_function
-
 import abc
 import collections
 from datetime import datetime

tripleoclient/v1/overcloud_netenv_validate.py

@@ -12,7 +12,6 @@
 #   License for the specific language governing permissions and limitations
 #   under the License.
 #
-from __future__ import print_function
 
 import itertools
 import logging

tripleoclient/v1/overcloud_plan.py

@@ -10,8 +10,6 @@
 #   License for the specific language governing permissions and limitations
 #   under the License.
 
-from __future__ import print_function
-
 import logging
 import os.path
 

tripleoclient/v1/overcloud_roles.py

@@ -13,8 +13,6 @@
 #   under the License.
 #
 
-from __future__ import print_function
-
 import collections
 import os
 import sys

tripleoclient/v1/tripleo_config.py

@@ -12,7 +12,6 @@
 #   License for the specific language governing permissions and limitations
 #   under the License.
 #
-from __future__ import print_function
 
 import argparse
 import logging

tripleoclient/v1/tripleo_deploy.py

@@ -12,7 +12,6 @@
 #   License for the specific language governing permissions and limitations
 #   under the License.
 #
-from __future__ import print_function
 
 import argparse
 import json

tripleoclient/v1/tripleo_launch_heat.py

@@ -12,7 +12,6 @@
 #   License for the specific language governing permissions and limitations
 #   under the License.
 #
-from __future__ import print_function
 
 import argparse
 import getpass

tripleoclient/workflows/baremetal.py

@@ -12,8 +12,6 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-from __future__ import print_function
-
 import six
 
 from tripleo_common.actions import baremetal

tripleoclient/workflows/deployment.py

@@ -9,7 +9,6 @@
 # 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 copy
 import getpass

tripleoclient/workflows/package_update.py

@@ -9,7 +9,6 @@
 # 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
 
 from heatclient.common import event_utils
 from tripleo_common.utils import plan

tripleoclient/workflows/scale.py

@@ -12,7 +12,6 @@
 # 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
 
 from heatclient.common import event_utils
 from tripleo_common.actions import scale