LU-13813 tests: fix stack_trap in conf-sanity test 110/111

LU-13813 tests: fix stack_trap in conf-sanity test 110/111

This patch fixes stack_trap in conf-sanity test 110 and 111
to restore test environment.

Test-Parameters: trivial env=SLOW=yes,ENABLE_QUOTA=yes \
clientdistro=el8.5 serverdistro=el8.5 testlist=conf-sanity

Test-Parameters: trivial env=SLOW=yes,ENABLE_QUOTA=yes \
fstype=zfs \
clientdistro=el8.5 serverdistro=el8.5 testlist=conf-sanity

Test-Parameters: trivial env=SLOW=yes,ENABLE_QUOTA=yes \
mdscount=2 mdtcount=4 \
clientdistro=el8.5 serverdistro=el8.5 testlist=conf-sanity

Change-Id: I540d96e8ad2c4990e7da18fe22256b44e9a19c72
Signed-off-by: Jian Yu <yujian@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/48021
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>