LU-3809 test: Cleanup if replay-single/58[bc] fail

Cleanup state if replay-single/58b or 58c have an error.  This will
unmount MOUNT2.

Signed-off-by: Nathaniel Clark <nathaniel.l.clark@intel.com>
Change-Id: I471408ffe1aa818be16b6a36ccf6b7e9e9e9891e
Reviewed-on: http://review.whamcloud.com/7419
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Reviewed-by: James Nunez <james.a.nunez@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>