Description of problem:
If you want to change path of the localfs storage connection, it always fails with "Domain is either partially accessible or entirely inaccessible"

From vdsm.log:
Thread-514::INFO::2013-10-03 11:30:26,149::fileSD::520::Storage.StorageDomain::(getStats) sdUUID=d8506641-027c-4efb-93ec-1d90d70c11a3 [Errno 2] No such file or directory: '/rhev/data-center/mnt/_home_rest__test__domain__1__2013__10__03__11__16__36__418573/d8506641-027c-4efb-93ec-1d90d70c11a3'
Thread-514::ERROR::2013-10-03 11:30:26,149::task::850::TaskManager.Task::(_setError) Task=`a995f64e-d927-45e2-8c30-a7f8430ffbe9`::Unexpected error
Traceback (most recent call last):
  File "/usr/share/vdsm/storage/task.py", line 857, in _run
    return fn(*args, **kargs)
  File "/usr/share/vdsm/logUtils.py", line 45, in wrapper
    res = f(*args, **kwargs)
  File "/usr/share/vdsm/storage/hsm.py", line 2772, in getStorageDomainStats
    stats = dom.getStats()
  File "/usr/share/vdsm/storage/fileSD.py", line 523, in getStats
    raise se.StorageDomainAccessError(self.sdUUID)
StorageDomainAccessError: Domain is either partially accessible or entirely inaccessible: ('d8506641-027c-4efb-93ec-1d90d70c11a3',)

Version-Release number of selected component (if applicable): is17


How reproducible:


Steps to Reproduce:
1. create a localfs storage domain
2. create another directory on the host with appropriate permissions (36:36)
3. put the storage domain to maintenance
4. copy the storage domain directory content to the new directory (not needed, will fail even if the 
5. try to change the storage domain and set path to the new one

Actual results: action fails with "Domain is either partially accessible or entirely inaccessible"


Expected results: should pass


Additional info: