added , back to inventory spliting

lib/ansible/inventory/__init__.py

@@ -181,8 +181,9 @@ class Inventory(object):
 
         # process patterns
         if isinstance(pattern, list):
-            pattern = ';'.join(pattern)
-        patterns = pattern.replace(";",":").split(":")
+            patterns = pattern
+        else:
+            patterns = pattern.replace(";",":").replace(",",":").split(":")
         hosts = self._get_hosts(patterns)
 
         # exclude hosts not in a subset, if defined