Fix docs and imports for os_project_access

lib/ansible/modules/cloud/openstack/os_project_access.py

@@ -13,6 +13,9 @@
 # You should have received a copy of the GNU General Public License
 # along with this software.  If not, see <http://www.gnu.org/licenses/>.
 
+from __future__ import (absolute_import, division, print_function)
+__metaclass__ = type
+
 ANSIBLE_METADATA = {'metadata_version': '1.1',
                     'status': ['preview'],
                     'supported_by': 'community'}
@@ -44,6 +47,9 @@ options:
   resource_name:
     description:
       - The resource name (eg. tiny).
+  availability_zone:
+    description:
+      - The availability zone of the resource.
 requirements:
     - "shade"