Negative karma should remove requests for stable/batched if the update was autopushed

[bowlofeggs]

@kparal reported to me that Bodhi will push an update to stable if the update receives negative karma after the request was already set to stable/batched.

We have code to disable autopushing when we receive negative karma, but it doesn't take action if the update is already requested to stable or batched. Of course, we don't want to stop a request if the maintainer submitted the update, so we should detect whether the update was pushed stable by Bodhi or by the maintainer before revoking the request.

[keszybz]

There is no batched any more, so maybe this can be closed?