[actorcore] fix actorcore help parsing

This issue was initially filed into JIRA by 'cloomis' at 01/Oct/15 3:30 PM as ICS-12.

The xcuActor wraps many devices, and so has a nested command structure. E.g.
{{
('temps', 'flash ', self.flash),
('temps', 'status', self.status),
('temps', 'test1', self.test1),
('temps', 'test2', self.test2),
}}

This causes a rather silly explosion of help entries. I suspect I caused the problem when trying to merge multiple commands calling a single method.

This makes xcuActor help absolutely useless; perhaps this should be Critical.