added user function

Author: HolgerHees

python/shared/helper.py

@@ -491,6 +491,10 @@ def getStableItemState( now, itemName, checkTimeRange ):
     return value
 
 class UserHelper:
+    @staticmethod
+    def getUserNames():
+        return userConfigs.keys()
+
     @staticmethod
     def getUserByStateItem(stateItem):
         for userName in userConfigs: