DELETE opration should do `drbdadm down` first

[mhkarimi1383]

Sometimes after disaster recovery I want to remove some volumes/resources that are having a single replica
but when I want to remove them I will get Failed to adjust DRBD resource error, But after running drbdadm down in the satellite, I was able to remove diskless resources that are attached to main resource and then removed main resource without problem

NOTE: deployed linstor using https://github.com/piraeusdatastore/piraeus-operator

[mhkarimi1383]

Or a delete-on-all-nodes command that would will bring main one down then starts delete process by removing secondaries one by one and removing main at last part