Improve test coverage of pg_rewind

Michael Paquier <michael@paquier.xyz>

Commit: 55ba56415bae6ac1f43c12d54537bd60eaa2153b
Author: Michael Paquier <michael@paquier.xyz>
Date: 2019-10-08T02:46:30Z
Releases: 13.0
Improve test coverage of pg_rewind

This includes new TAP tests for a couple of areas not covered yet and
some improvements:
- More coverage for --no-ensure-shutdown, the enforced recovery step and
--dry-run.
- Failures with option combinations and basic option checks.
- Removal of a duplicated comment.

Author: Alexey Kondratov, Michael Paquier
Discussion: https://postgr.es/m/20191007010651.GD14532@paquier.xyz

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