os_server, doc: add version added for delete_fip

Also see #3509

cloud/openstack/os_server.py

@@ -184,6 +184,7 @@ options:
          associated with the instance will be deleted along with the instance.
      required: false
      default: false
+     version_added: "2.2"
 requirements:
     - "python >= 2.6"
     - "shade"
@@ -437,11 +438,11 @@ def _create_server(module, cloud):
     if flavor:
         flavor_dict = cloud.get_flavor(flavor)
         if not flavor_dict:
-            module.fail_json(msg="Could not find flavor %s" % flavor) 
+            module.fail_json(msg="Could not find flavor %s" % flavor)
     else:
         flavor_dict = cloud.get_flavor_by_ram(flavor_ram, flavor_include)
         if not flavor_dict:
-            module.fail_json(msg="Could not find any matching flavor") 
+            module.fail_json(msg="Could not find any matching flavor")
 
     nics = _network_args(module, cloud)