squid: qa/tasks/quiescer: dump ops in parallel

squid: qa/tasks/quiescer: dump ops in parallel

Since this --flags=locks takes the mds_lock and dumps thousands of ops, this
may take a long time to complete for each individual MDS. The entire quiesce
set may timeout (and all q ops killed) before we finish dumping ops.

Fixes: https://tracker.ceph.com/issues/65823
Signed-off-by: Patrick Donnelly <pdonnell@redhat.com>
(cherry picked from commit 15f734ec6291bf918d704d7d3e6330b5606c47e3)
Fixes: https://tracker.ceph.com/issues/66103
Signed-off-by: Leonid Usov <leonid.usov@ibm.com>