Reset master xmin when hot_standby_feedback disabled.

Simon Riggs <simon@2ndQuadrant.com>

Commit: 2dde11a632d3fe309b5af5480d01a0a3028f7f64
Author: Simon Riggs <simon@2ndQuadrant.com>
Date: 2014-07-15T13:40:23Z
Releases: 9.2.9
Reset master xmin when hot_standby_feedback disabled.
If walsender has xmin of standby then ensure we
reset the value to 0 when we change from hot_standby_feedback=on
to hot_standby_feedback=off.

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