Fix handling of locked channels in access check

When a channels is being removed according to [1], the access check will
currently loop forever trying to get information for that channel,
ignoring the

    You are not authorized to perform this operation.

message that chanserv is sending. Instead we should fail on that
scenario.

[1]
https://docs.openstack.org/infra/system-config/irc.html#renaming-an-irc-channel

Depends-On: Ie7593223564b376f6bac072b7afc3449e90ea1f9
Change-Id: I1fe813c16b243bf78dcc6af9ff385cf77087c388

tools/check_irc_access.py

@@ -93,6 +93,13 @@ class CheckAccess(irc.client.SimpleIRCClient):
             self.current_channel = None
             self.advance()
             return
+        if msg.endswith('not authorized to perform this operation.'):
+            self.failed = True
+            print("%s can not be queried from ChanServ." %
+                  self.current_channel)
+            self.current_channel = None
+            self.advance()
+            return
         if msg.startswith('End of'):
             found = False
             for nick, flags, msg in self.current_list: