Report catalog_xmin separately in hot_standby_feedback

Simon Riggs <simon@2ndQuadrant.com>

Commit: 5737c12df0581b3298e3e9586bdef170811ce176
Author: Simon Riggs <simon@2ndQuadrant.com>
Date: 2017-03-25T14:07:27Z
Releases: 10.0
Report catalog_xmin separately in hot_standby_feedback

If the upstream walsender is using a physical replication slot, store the
catalog_xmin in the slot's catalog_xmin field. If the upstream doesn't use a
slot and has only a PGPROC entry behaviour doesn't change, as we store the
combined xmin and catalog_xmin in the PGPROC entry.

Author: Craig Ringer

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