'Clean up'

@classmethod
def cleanup(cls):

    info('***    Cleaning    up    cluster\n')
    for (server, user) in cls.serveruser.iteritems():
        if (server == 'localhost'):
            continue
        else:
            cmd = ['su', user, '-c', ('ssh    %s@%s    sudo    mn    -c' % (user, server))]
            info(cmd, '\n')
            info(quietRun(cmd))
