MySQL Bugs: #97596: MTR doesn't check for remaining files when --parallel

Bug #97596	MTR doesn't check for remaining files when --parallel > 1
Submitted:	12 Nov 2019 11:58
Reporter:	Erlend Dahl	Email Updates:
Status:	Verified	Impact on me:	None
Category:	Tools: MTR / mysql-test-run	Severity:	S3 (Non-critical)
Version:	8.0	OS:	Any
Assigned to:		CPU Architecture:	Any

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Description:
See the following bugs:

Bug#97453 MTR tests failed for main.mysqladmin
Bug#97454 MTR tests failed for binlog.binlog_rewrite_order
Bug#97592 MTR tests failed for main.lowercase_view

They all show that check-testcase doesn't find leftover files in $MYSQLTEST_VARDIR/tmp and $MYSQL_TMP_DIR (are these the same?) when --parallel is set to something > 1. 

When --parallel=1, it correctly reports the files that have not been deleted by the test.

How to repeat:
Revert the patches for the above bugs and run the tests.

Suggested fix:
Make check-testcase check correctly also when --parallel > 1.