LU-8200 test: improve sanityn.sh 33c

LU-8200 test: improve sanityn.sh 33c

If transaction is committed before unlock, lock won't be saved. So
trigger Sync-Lock-Cancel twice in sanityn.sh 33c, it's unlikely to
fail both.

Test-Parameters: trivial clientcount=2 mdscount=2 mdtcount=4 \
osscount=1 ostcount=8 mdtfilesystemtype=zfs ostfilesystemtype=zfs \
testlist=sanityn
Signed-off-by: Lai Siyao <lai.siyao@intel.com>
Change-Id: I5c99e5a8261df8c9f463aea7ed67df95baaf3e6c
Reviewed-on: https://review.whamcloud.com/31673
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Alex Zhuravlev <alexey.zhuravlev@intel.com>
Reviewed-by: Jian Yu <jian.yu@intel.com>
Reviewed-by: James Nunez <james.a.nunez@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>