Drop the implementation of CHECK_SRVIDS control

[Volker Lendecke]

On Fri, Aug 25, 2017 at 12:53:30PM +1000, Amitay Isaacs via samba-technical wrote:
> Just another thought.  CTDB also has SERVER_ID related controls.
> That might be well suited to identify each process registered with CTDB.
> And treat SRVID as pure messaging construct.

Right. But they are implemented as control_not_implemented(), so I
thought they would go soon as well.

For the pure process existence check I'd be happy to do what the local
check does: Look whether the process exists and the unique ID matches.
This can be done fine if every process registers both PID and unique
ID with the messaging-related CTDB_CONTROL_REGISTER_SRVID call. And
then have another control that checks both to exist on a single
socket. I know that's overloading the messaging IDs, but they are
kindof overloaded for local messaging too.

Volker

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