[booth] pcs booth status does not reflect where is the cluster-local booth representative running (if so)

[jnpkrn]

In case you happen to run said command in case you didn't pick the
right, "currently representative" node, you get to see an unexpected
outcome:

# pcs booth status
> Error: unable to get status of booth daemon: Dec 10 20:40:10 virt-154 booth: [13424]: error: Cannot find myself in the configuration.

Well, of course, you cannot, since pcs invoked you at the wrong node
(lazily, just the local one right away).

What should pcs have done instead:

1. realize whether the home node is part of the cluster with multisite
   clustering configured

2. if so, it shall deduce where the local cluster representative is
   currently running within cluster, and route the request over there[*]

3. if not, currentl behaviour is likely fine, expect to report
   from local arbitrator POV

[*] regarding "routing the request (soliciting info), there are
2 possiblities:

• A. utilize presumed pcs intra-node communication infrastructure,
  route the request to the target node using pcs-native means,
  than route the response back the same way

  • this is preferred to satisfy reporting from booth
    booth list and booth status

• B. utilize "distributed/non-local connectivity" of booth,
  allowing for booth status command to return non-success
  and replacing the booth list -c booth command with
  booth list -s <booth virtual IP>

  • this only deals with booth list side of the report,
    hence A. is strongly recommended (when applied within
    cluster, you want to get the same information back
    regardless if where the cluster-local booth representative
    is running)

[tomjelinek]

Due to time constraints and other priorities, we haven't been able to implement these planned higher level booth commands which would be aware of the whole booth formation and which would be able to operate at a cluster level and booth formation level. For the users to be able to set booth at least somehow, only the node-level commands have been implemented. Those, even if not as comfortable as one may desire, provide a complete set of operations needed for configuring and managing booth.

The plans for the more comfortable booth management are still there. Unfortunately given current developer resources and backlog, it is a "blue-sky" project for now.