Merge PR #39847 into master

* refs/pull/39847/head:
	qa/cephfs: don't expect "file exists" error for "mkdir -p"
	qa/cephfs: don't take parameter cwd in _create_mntpt()

Reviewed-by: Patrick Donnelly <pdonnell@redhat.com>
Reviewed-by: Xiubo Li <xiubli@redhat.com>

diff --cc qa/tasks/cephfs/mount.py
Simple merge

diff --cc qa/tasks/vstart_runner.py
Simple merge