qa/cephfs: fix test_disallow_monitor_managed_snaps_for_fs_pools

[rishabh-d-dave]

run_cluster_cmd() method is not available anymore because it was deleted
here on this PR -
https://github.com/ceph/ceph/pull/50569/files#diff-1c6c246ba42f343603d7174198dd1fb9c2654b6c883594d1a0891096b7a35875L408

Fixes: https://tracker.ceph.com/issues/62243

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[vshankar]

jenkins retest this please

[rishabh-d-dave]

http://pulpito.front.sepia.ceph.com/rishabh-2023-08-02_12:24:04-fs:functional-wip-rishabh-2023Aug1-testing-default-smithi/

[vshankar]

@rishabh-d-dave I guess this is ready to merge?

[rishabh-d-dave]

@vshankar Yes. This PR is ready for merge now since the test ran successfully and test_disallow_monitor_managed_snaps_for_fs_pools is passing now successfully -

2023-08-02T12:48:45.352 INFO:teuthology.orchestra.run.smithi026.stderr:2023-08-02T12:48:45.345+0000 7f9e57693640  1 -- 172.21.15.26:0/563920022 shutdown_connections
2023-08-02T12:48:45.352 INFO:teuthology.orchestra.run.smithi026.stderr:2023-08-02T12:48:45.345+0000 7f9e57693640  1 -- 172.21.15.26:0/563920022 wait complete.
2023-08-02T12:48:45.370 INFO:tasks.cephfs_test_runner:test_disallow_monitor_managed_snaps_for_fs_pools (tasks.cephfs.test_snapshots.TestMonSnapsAndFsPools) ... ok

[rishabh-d-dave]

Just for record: this bug fixed on this PR was introduced on PR #50569.