cpe_cloud reports success for aborted jobs

[Jason Hobbs]

See http://paste.ubuntu.com/25589047/ for example

This is because 'success' is determined as the absence of failure strings:

def get_status(text):
    """Return the status of job output in text."""
    if 'marked build as failure' in text \
            or 'Marking the build as failed' in text:
        return 'failure'
    return 'success'