LU-8348 recovery: don't send last_committed after panic

LU-8348 recovery: don't send last_committed after panic

Do not update last_committed if we are not sure the
commit was successful.

Signed-off-by: Alexey Lyashkov <alexey.lyashkov@seagate.com>
Seagate-bug-id: MRP-3013
Change-Id: I176b86a01cac46bd7d6af85843135a57a3df0e87
Reviewed-on: http://review.whamcloud.com/21060
Reviewed-by: Mike Pershin <mike.pershin@intel.com>
Reviewed-by: Alex Zhuravlev <alexey.zhuravlev@intel.com>
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>