Test replay of regression tests, attempt II.
See commit message for
123828a7fa563025d0ceee10cf1b2a253cd05319. The
only change this time is the order of the arguments passed to
pg_regress. The previously version broke in the build farm environment
due to the contents of EXTRA_REGRESS_OPTS (see also commit
8cade04c
which had to do something similar).
Discussion: https://postgr.es/m/CA%2BhUKGKpRWQ9SxdxxDmTBCJoR0YnFpMBe7kyzY8SUQk%2BHeskxg%40mail.gmail.com