qa: fix pool-quota related tests

qa: fix pool-quota related tests

https://github.com/ceph/ceph/pull/17371 introduces support of
per-pool space-full flag, which turns out to set both
full and full_no_quota flags now if a pool is currently running out
of quota.

Actually this test is fragile as long as we keep appending new flags
at pool granularity, but let's not bother with that complexity now.

Fixes: http://tracker.ceph.com/issues/21409
Signed-off-by: xie xingguo <xie.xingguo@zte.com.cn>
(cherry picked from commit 5dd3458eec7d6c56a71ee6f0fcdd45aa15a58ec7)