Remove "master"/"slave" usage from PL/pgSQL tests

When Who What
2019-08-21 10:06:41 Peter Eisentraut (petere) Closed in commitfest 2019-09 with status: Committed
2019-08-21 10:06:41 Peter Eisentraut (petere) Changed committer to petere
2019-08-16 14:57:05 Peter Eisentraut (petere) Added petere as reviewer
2019-07-02 17:11:07 Dagfinn Ilmari Mannsåker (ilmari) Added annotation "Start of relevant subthread" to d8jzhmdwlpg.fsf@dalvik.ping.uio.no
2019-07-02 17:10:33 Dagfinn Ilmari Mannsåker (ilmari) Changed authors to Dagfinn Ilmari Mannsåker (ilmari)
2019-07-02 17:10:23 Dagfinn Ilmari Mannsåker (ilmari) Attached mail thread E393EC88-377F-4C59-A67A-69F2A38D17C7@yesql.se
2019-07-02 17:10:22 Dagfinn Ilmari Mannsåker (ilmari) Created patch record