1169741 - accept more power status messages

addressing:
Fri Dec  5 14:39:24 2014 - INFO | Exception occured: <class 'cobbler.cexceptions.CX'>
Fri Dec  5 14:39:24 2014 - INFO | Exception value: "command succeeded (rc=0), but output ('Chassis Power is on\n') was not understood"
Fri Dec  5 14:39:24 2014 - INFO | Exception Info:
  File "/usr/lib/python2.6/site-packages/cobbler/utils.py", line 123, in die
    raise CX(msg)

Fri Dec  5 14:39:24 2014 - INFO | Exception occured: <class 'cobbler.cexceptions.CX'>
Fri Dec  5 14:39:24 2014 - INFO | Exception value: "command succeeded (rc=0), but output ('Chassis Power is on\n') was not understood"
Fri Dec  5 14:39:24 2014 - INFO | Exception Info:
  File "/usr/lib/python2.6/site-packages/cobbler/remote.py", line 1766, in _dispatch
    return method_handle(*params)
   File "/usr/lib/python2.6/site-packages/cobbler/remote.py", line 1723, in power_system
    rc=self.api.power_status(obj, user=None, password=None, logger=logger)
   File "/usr/lib/python2.6/site-packages/cobbler/api.py", line 829, in power_status
    return action_power.PowerTool(self._config, system, self, user, password, logger = logger).power("status")
   File "/usr/lib/python2.6/site-packages/cobbler/action_power.py", line 127, in power
    utils.die(self.logger,"command succeeded (rc=%s), but output ('%s') was not understood" % (rc, output))
   File "/usr/lib/python2.6/site-packages/cobbler/utils.py", line 131, in die
    raise CX(msg)
Automatic commit of package [cobbler20] minor release [2.0.11-39].