Refactor GetOldestXmin() to use flags

Simon Riggs <simon@2ndQuadrant.com>

Commit: af4b1a0869bd3bb52e5f662e4491554b7f611489
Author: Simon Riggs <simon@2ndQuadrant.com>
Date: 2017-03-22T16:51:01Z
Releases: 10.0
Refactor GetOldestXmin() to use flags

Replace ignoreVacuum parameter with more flexible flags.

Author: Eiji Seki
Review: Haribabu Kommi

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