Use built-in print() instead of print statement

In python 3 print statement is not supported, so we should use
only print() functions.

Fixes bug 1226943

Change-Id: I7b2e4d52fe9050f6a67c44e4cc1237a15ea90b23

bin/cinder-manage

@@ -512,7 +512,7 @@ def main():
         print(_("\nOpenStack Cinder version: %(version)s\n") %
               {'version': version.version_string()})
         print(script_name + " category action [<args>]")
-        print (_("Available categories:"))
+        print(_("Available categories:"))
         for category in CATEGORIES:
             print("\t%s" % category)
         sys.exit(2)

doc/ext/cinder_autodoc.py

@@ -1,3 +1,5 @@
+from __future__ import print_function
+
 import gettext
 import os
 
@@ -7,6 +9,6 @@ from cinder import utils
 
 
 def setup(app):
-    print "**Autodocumenting from %s" % os.path.abspath(os.curdir)
+    print("**Autodocumenting from %s" % os.path.abspath(os.curdir))
     rv = utils.execute('./doc/generate_autodoc_index.sh')
-    print rv[0]
+    print(rv[0])