Cleanup SHM object before and after running an AlignSample task
Cleanup SHM object before and after running an AlignSample task

We've been having issues with leftovers that cannot be cleared when the
pipeline is run by multiple users, so we move to a systematic cleanup strategy.

ppavlidis/rnaseq-pipeline,ppavlidis/rnaseq-pipeline,ppavlidis/rnaseq-pipeline