Ian Barwick cd7f36a6fd Add general check function "check_replication_slots_available()" ...

Make the code previously only used by "standby follow" generally
available - we'll want to use this from "node rejoin" as well.

While we're at it, when reporting failure due to lack of free
replication slots, report the current value of "max_replication_slots".

2020-02-03 16:43:55 +09:00

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