Rowsecurity test breaks mm

```
:MtmGucSet: session_authorization -> regress_rls_bob
ERROR:  catalog is missing 3 attribute(s) for relid 32389
ERROR:  catalog is missing 3 attribute(s) for relid 32389
LOG:  WAL-sender to 3 is terminated
LOG:  WAL-sender to 2 is terminated
ERROR:  replication slot "mtm_slot_3" already exists
ERROR:  replication slot "mtm_slot_2" already exists
```
