qa: Fix test_subvolume_snapshot_info_if_orphan_clone
Fixes the usage of the grep command. It was failing as below.
smithi008:> (cd /home/ubuntu/cephtest/mnt.0 && exec sudo grep '"clone' 'snaps"' \
-A3 ./volumes/_nogroup/subvolume_0000000000856603/.meta)
INFO:teuthology.orchestra.run.smithi008.stderr:grep: snaps": No such file or directory.
Fixes: https://tracker.ceph.com/issues/57446
Signed-off-by: Kotresh HR <khiremat@redhat.com>
(cherry picked from commit
b6291096d1205456a8320063d4d629ca093bd041)