[DR] removing server protection does NOT clean drbd correctly on nodes

anvil-manage-dr --server an-test-deploy1 --remove ...

DR node is cleaned properly, but on the nodes there is an inconsistency.

/etc/drbd.d/an-test-deploy1.res is correct and no longer contains info about DR, but:

```
# drbdadm status an-test-deploy1
an-test-deploy1 role:Primary
disk:UpToDate open:yes
an-a01n02 role:Secondary
peer-disk:UpToDate
ci connection:Connecting
```

It´s unclear if this is a bug in anvil that is not sending the new config to DRBD or it´s a DRBD bug. Operations continue without problem "prio normal" but it is misleading and can cause incorrect reports to the end user (blocker)