Comment 1 for bug 1312694

bug re-occurred again.
Please fix this problem.
ErrorMessage: executing 'rm -rf /mnt//lava' failed with code 1
OperationFailed: executing 'rm -rf /mnt//lava' failed with code 1

Due to this bug LTP test results missing from the results bundle.
LTP test suite executed successfully but results missing from the results bundle.

https://validation.linaro.org/scheduler/job/123302/log_file#L_93_0

 ErrorMessage: executing 'rm -rf /mnt//lava' failed with code 1
 Lava failed at action lava_test_shell with error:executing 'rm -rf /mnt//lava' failed with code 1
 Traceback (most recent call last):
  File "/srv/lava/.cache/git-cache/exports/lava-dispatcher/2014.03-17-g9381215/lava_dispatcher/job.py", line 326, in run
  action.run(**params)
  File "/srv/lava/.cache/git-cache/exports/lava-dispatcher/2014.03-17-g9381215/lava_dispatcher/actions/lava_test_shell.py", line 724, in run
  self._bundle_results(target, signal_director, testdef_objs)
  File "/srv/lava/.cache/git-cache/exports/lava-dispatcher/2014.03-17-g9381215/lava_dispatcher/actions/lava_test_shell.py", line 972, in _bundle_results
  raise e
 OperationFailed: executing 'rm -rf /mnt//lava' failed with code 1