Fix standalone AD join from a HA cluster

A HA host with CTDB installed but not configured fails to join the
domain, as the ctdb crm resource cannot be located; (bnc#865445).

The AD join logic should fall-back to standalone (non-clustered)
membership unless a ctdb resource is configured.
Add myself to the maintainers file
Merge pull request #19 from ddiss/bnc865445_standalone_ha_join_mstr

Bnc865445 standalone ha join for master