executing 'rm -rf /mnt//lava' failed with code 1

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

rm -rf /mnt/lava is being blamed for errors elsewhere in the job which just leave a dangling error report. The plan is to fix this as part of the LAVA sprint so that dispatcher operations clean the environment each time and to be responsible for all errors within each object and not allow error codes to drop through to later operations.