integrations: Remove from __future__ imports.

zulip/integrations/perforce/git_p4.py

@@ -7,9 +7,6 @@
 #            2007 Trolltech ASA
 # License: MIT <http://www.opensource.org/licenses/mit-license.php>
 #
-from __future__ import print_function
-from __future__ import absolute_import
-from __future__ import division
 import sys
 import six
 from six.moves import input

zulip/integrations/perforce/zulip_change-commit.py

@@ -14,7 +14,6 @@ For example:
   1234 //depot/security/src/
 
 '''
-from __future__ import print_function
 
 import os
 import sys