Ok, here's a new version incorporating feedback so far.
1. Invoke pg_regress directly (no make).
2. Use PG_TEST_EXTRA="wal_consistency_checking" as a way to opt in to the more expensive test.
3. Use parallel schedule rather than serial. It's faster but also the non-determinism might discover more things. This required changing the TAP test max_connections setting from 10 to 25.
4. Remove some extraneous print statements and check-if-data-is-replicated-using-SELECT tests that are technically not needed (I had copied those from 001_stream_rep.pl).
Thank you for working on this test set!
I was especially glad to see the skip-tests option for pg_regress. I think it will become a very handy tool for hackers.
To try the patch I had to resolve a few merge conflicts, see a rebased version in attachments.
