[patch] Patch to fix double call to "mock clean" in case, if mock will failed on "prep" stage.

[Alexandr Kanevskiy]

Hi all.

I found one small issue, that in case of mock will fail on prep stage
(no space on device, or repository access failed) mock will return
earlier, and in _status_prepping(), _watch_mock function will call
_start_cleanup(). After that _start_cleanup will change next state to be
"cleanup". But, this "if" below, will change next status to "building"
regardless of previous error:
            if not self._mock_using_repo():
                self._status = 'building'

that meas scenario: 
	_status_prepping
		_watch_mock
      			mock clean
	_status_building
		_watch_mock
			mock clean

Attached patch solves that.
-- 
Alexandr Kanevskiy.
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