Merge pull request #11631 from bearstech/gce

GCE tag prefix for creating ansible group.

contrib/inventory/gce.py

@@ -257,6 +257,9 @@ class GceInventory(object):
 
             tags = node.extra['tags']
             for t in tags:
+                if t.startswith('group-'):
+                    tag = t[6:]
+                else:
                     tag = 'tag_%s' % t
                 if groups.has_key(tag): groups[tag].append(name)
                 else: groups[tag] = [name]