Ian Barwick ee2df36a76 "standby switchover": additional sanity checks ...

Check that sufficient walsenders will be available on the promotion
candidate, and if replication slots are in use check if enough of
those will be available.

Note these checks can't guarantee that the walsenders/slots will
be available at the appropriate points during the switchover process,
but do ensure that existing configuration problems will be caught.

Implements GitHub #371.

2018-02-08 15:19:24 +09:00

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