Use the print function

In Python 3, `print` is no longer a statement. Call it as a function
everywhere, and include the future import to remove the statement
in Python 2 code as well.

Reviewed-By: Christian Heimes <cheimes@redhat.com>
Reviewed-By: Jan Cholasta <jcholast@redhat.com>

doc/examples/python-api.py

@@ -43,5 +43,5 @@ else:
 
 
 # Now that you're connected, you can make calls to api.Command.whatever():
-print 'The admin user:'
-print api.Command.user_show(u'admin')
+print('The admin user:')
+print(api.Command.user_show(u'admin'))