Ian Barwick 539861cb58 repmgrd: during failover, check if a node was already promoted ...

Previously, repmgrd assumed that during a failover, there would not
already be another primary node. However it's possible a node was
promoted manually. While this is not a desirable situation, it's
conceivable this could happen in the wild, so we should check for
it and react accordingly.

Also sanity-check that the follow target can actually be followed.

Addresses issue raised in GitHub #420.

2019-03-22 14:06:41 +09:00

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