Fix ssconf.GetMasterAndMyself

The ssconf migration left this out.

Reviwed-by: imsnah,ultrotter

lib/ssconf.py

@@ -108,9 +108,10 @@ def GetMasterAndMyself(ss=None):
 
   """
   if ss is None:
-    ss = SimpleStore()
+    ss = SimpleConfigReader()
   return ss.GetMasterNode(), utils.HostInfo().name
 
+
 def CheckMaster(debug, ss=None):
   """Checks the node setup.