meta sub-command allows extra arguments

[poy]

I would expect the following to fail:

cf log-cache meta foo

However, it happily accepts the extra argument (foo).

[cf-gitbot]

We have created an issue in Pivotal Tracker to manage this:

https://www.pivotaltracker.com/story/show/155419642

The labels on this github issue will be updated when the story is started.