qa/cephfs: update a test in test_volumes.py

Test name is test_subvolume_snapshot_info_if_clone_pending_for_no_group,
located in class TestSubvolumeSnapshotClones in test_volumes.py

5 seconds can (sometimes) be insufficient as value of the config option
"snapshot_clone_delay" in this. Increase it to avoid unnecessary race
conditions which leads to irrelevant failures.

Following is an example where 5 seconds was insufficient as waiting
period since instead it took 8 seconds -

2024-07-28T18:16:10.088 DEBUG:teuthology.orchestra.run.smithi064:> sudo adjust-ulimits ceph-coverage /home/ubuntu/cephtest/archive/coverage timeout 120 ceph --cluster ceph config set mgr mgr/volumes/snapshot_clone_no_wait False
...
2024-07-28T18:16:18.694 DEBUG:teuthology.orchestra.run.smithi064:> sudo adjust-ulimits ceph-coverage /home/ubuntu/cephtest/archive/coverage timeout 120 ceph --cluster ceph fs subvolume snapshot info cephfs subvol79370 subvol_snap40980

This issue was seen during testing of PR to which this commit belongs.

This commit has been separated from the commit that adds tests for clone
progress reporting so that it's easy to document need for this code
patch and also track it.

This commit is not being moved to a different PR and been kept on the
same PR since it can't be reproduced otherwise. This also ensures that
commit is backported to older release along with code that caused this
issue, causing no one to need to find this commit while backporting
effort.

Signed-off-by: Rishabh Dave <[email protected]>

Author: rishabh-d-dave

qa/tasks/cephfs/test_volumes.py

@@ -5845,7 +5845,7 @@ def test_subvolume_snapshot_info_if_clone_pending_for_no_group(self):
         self._fs_cmd("subvolume", "snapshot", "create", self.volname, subvolume, snapshot)
 
         # insert delay at the beginning of snapshot clone
-        self.config_set('mgr', 'mgr/volumes/snapshot_clone_delay', 5)
+        self.config_set('mgr', 'mgr/volumes/snapshot_clone_delay', 15)
 
         # disable "capped" clones
         self.config_set('mgr', 'mgr/volumes/snapshot_clone_no_wait', False)