Two tiny fixed related to runtime functionality

Adds an assert and fixes a typo.

Signed-off-by: Iustin Pop <iustin@google.com>
Reviewed-by: Michael Hanselmann <hansmi@google.com>

lib/daemon.py

@@ -621,6 +621,7 @@ def _VerifyDaemonUser(daemon_name):
     constants.NODED: getents.noded_uid,
     constants.CONFD: getents.confd_uid,
     }
+  assert daemon_name in daemon_uids, "Invalid daemon %s" % daemon_name
 
   return (daemon_uids[daemon_name] == running_uid, running_uid,
           daemon_uids[daemon_name])

lib/runtime.py

@@ -171,7 +171,7 @@ def GetEnts(resolver=GetentResolver):
   """Singleton wrapper around resolver instance.
 
   As this method is accessed by multiple threads at the same time
-  we need to take thread-safty carefully
+  we need to take thread-safety carefully.
 
   """
   # We need to use the global keyword here