Ian Barwick 221fb63e92 repmgrd: fix startup on witness node when local data is stale ...

Previously, when running on a witness server, repmgrd didn't consider
the local cache of the "repmgr.nodes" table might be outdated, e.g.
as repmgrd wasn't running on the witness server during a failover,
so could potentially end up monitoring a former primary now running
as a standby.

When running on a witness server, at startup repmgrd will now scan
all nodes to determine the current primary, and refresh its local
cache from there. This will also ensure it can start up even if the
node currently registered as primary in the local cache is not available.

Implements GitHub #488 and #489.

2018-08-20 15:29:29 +09:00

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