Improve code coverage of select_parallel test.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 4b1dd62a257a469f92fef4f4cce37beab6c0b98b
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2017-08-31T17:15:54Z
Releases: 11.0
Improve code coverage of select_parallel test.

Make sure that rescans of parallel indexscans are tested.
Per code coverage report.

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