Fix XFS error and thinpool races
Fix XFS error and thinpool races

    Atomic/mount.py:
        Sometimes devices fail removal due to race-like
        conditions with EBUSY.  Adding --retry option
        to prevent these failures.

charliedrage/atomic,dustymabe/atomic,sallyom/atomic,sallyom/atomic,dustymabe/atomic,cdrage/atomic,rh-atomic-bot/atomic,cdrage/atomic,rh-atomic-bot/atomic,charliedrage/atomic