Add python3-compat boilerplate to all .py files in lib/ansible

lib/ansible/galaxy/api.py

@@ -20,6 +20,10 @@
 # along with Ansible.  If not, see <http://www.gnu.org/licenses/>.
 #
 ########################################################################
+
+from __future__ import (absolute_import, division, print_function)
+__metaclass__ = type
+
 import json
 from urllib2 import quote as urlquote, HTTPError
 from urlparse import urlparse