Ian Barwick 313aa3c5d7 Refactor follow verification to reduce need for CHECKPOINT ...

A CHECKPOINT is not always required; hopefully we can narrow it down
to one corner case where we need to determine the minium recovery
location.

Also get local timeline ID via IDENTIFY_SYSTEM, as fetching it from
pg_control risks returning the prior timeline ID if the timeline
switch has just taken place and no restart point has yet occurred.

2018-12-04 15:27:22 +09:00

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