Fix the following crash in a minion when master executes
state.highstate on it.

    2014-01-07 01:45:43,315 [salt.minion      ][INFO    ] User sudo_ubuntu Executing command state.highstate with jid 20140107014542797484
    2014-01-07 01:45:43,332 [salt.minion      ][WARNING ] The minion function caused an exception: Traceback (most recent call last):
      File "/usr/local/lib/python2.7/dist-packages/salt/minion.py", line 626, in _thread_return
        '''
      File "/usr/local/lib/python2.7/dist-packages/salt/modules/state.py", line 237, in highstate
        conflict = running()
      File "/usr/local/lib/python2.7/dist-packages/salt/modules/state.py", line 91, in running
        active = __salt__['saltutil.is_running']('state.*')
      File "/usr/local/lib/python2.7/dist-packages/salt/modules/saltutil.py", line 365, in is_running
        '''
      File "/usr/local/lib/python2.7/dist-packages/salt/modules/saltutil.py", line 396, in running
        continue
    AttributeError: 'module' object has no attribute 'os_is_running'

    2014-01-07 01:45:43,333 [salt.minion      ][INFO    ] Returning information for job: 20140107014542797484