mgr/telemetry: anonymizing smartctl report itself

smartctl JSON output contains the device's serial number in two
different keys ('serial_number' & 'output'). Serial is now obfuscated in
both.

Fixes: https://tracker.ceph.com/issues/43939
Signed-off-by: Yaarit Hatuka <yaarit@redhat.com>
(cherry picked from commit be1257f)

src/pybind/mgr/telemetry/module.py

@@ -400,9 +400,9 @@ def gather_device_report(self):
                                                            host, anon_host))
 
             # anonymize the smartctl report itself
-            for k in ['serial_number']:
-                if k in m:
-                    m.pop(k)
+            serial = devid.rsplit('_', 1)[1]
+            m_str = json.dumps(m)
+            m = json.loads(m_str.replace(serial, 'deleted'))
 
             if anon_host not in res:
                 res[anon_host] = {}