Restore partition_prune's usage of parallel workers

Alvaro Herrera <alvherre@alvh.no-ip.org>

Commit: 47c91b55991883322fdbc4495ce7fe6b2166e8fe
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2018-04-16T21:12:59Z
Releases: 11.0
Restore partition_prune's usage of parallel workers

This reverts commit 4d0f6d3f207d ("Attempt to stabilize partition_prune
test output (2)"), and attempts to stabilize the test by using string
replacement to hide any loop count difference in parallel nodes.

Discussion: https://postgr.es/m/4475.1523628300@sss.pgh.pa.us

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