qa/cephfs: pass MDS name, not FS name, to "ceph mds fail" cmd

This issue was not caught in original QA run because "ceph mds fail"
returns 0 even though MDS name received by it in argument is
non-existent. This is done for the sake of idempotency, however it
caused this bug to go uncaught.

Fixea: https://tracker.ceph.com/issues/65864
Signed-off-by: Rishabh Dave <[email protected]>

Author: rishabh-d-dave

qa/tasks/cephfs/test_admin.py

@@ -2283,7 +2283,7 @@ def test_with_health_warn_oversize_cache(self):
         errmsg = 'mds_cache_oversized'
         self.negtest_ceph_cmd(args=f'mds fail {active_mds_id}',
                               retval=1, errmsgs=errmsg)
-        self.run_ceph_cmd(f'mds fail {self.fs.name} --yes-i-really-mean-it')
+        self.run_ceph_cmd(f'mds fail {active_mds_id} --yes-i-really-mean-it')
 
     def test_with_health_warn_trim(self):
         '''
@@ -2307,7 +2307,7 @@ def test_with_health_warn_trim(self):
         errmsg = 'mds_trim'
         self.negtest_ceph_cmd(args=f'mds fail {active_mds_id}',
                               retval=1, errmsgs=errmsg)
-        self.run_ceph_cmd(f'mds fail {self.fs.name} --yes-i-really-mean-it')
+        self.run_ceph_cmd(f'mds fail {active_mds_id} --yes-i-really-mean-it')
 
     def test_with_health_warn_with_2_active_MDSs(self):
         '''
@@ -2345,5 +2345,5 @@ def test_with_health_warn_with_2_active_MDSs(self):
                               errmsgs=errmsg)
         self.negtest_ceph_cmd(args=f'mds fail {hw_mds_id}', retval=1,
                               errmsgs=errmsg)
-        self.run_ceph_cmd('mds fail mds1_id --yes-i-really-mean-it')
-        self.run_ceph_cmd('mds fail mds2_id --yes-i-really-mean-it')
+        self.run_ceph_cmd(f'mds fail {mds1_id} --yes-i-really-mean-it')
+        self.run_ceph_cmd(f'mds fail {mds2_id} --yes-i-really-mean-it')