MERGE post-commit review

Simon Riggs <simon@2ndQuadrant.com>

Commit: 4b2d44031f8c005f6f86364d7663858b6b5bdd14
Author: Simon Riggs <simon@2ndQuadrant.com>
Date: 2018-04-05T08:54:07Z
Releases: 11.0
MERGE post-commit review

Review comments from Andres Freund

* Consolidate code into AfterTriggerGetTransitionTable()
* Rename nodeMerge.c to execMerge.c
* Rename nodeMerge.h to execMerge.h
* Move MERGE handling in ExecInitModifyTable()
  into a execMerge.c ExecInitMerge()
* Move mt_merge_subcommands flags into execMerge.h
* Rename opt_and_condition to opt_merge_when_and_condition
* Wordsmith various comments

Author: Pavan Deolasee
Reviewer: Simon Riggs

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