de-deduplicate code in DML execution hooks in postgres_fdw

2019-01-17 05:49:28 Etsuro Fujita (efujita) Closed in commitfest 2019-01 with status: Committed 2019-01-17 05:49:07 Etsuro Fujita (efujita) Added efujita as committer 2018-11-29 17:56:53 Dmitry Dolgov (erthalion) Closed in commitfest 2018-11 with status: Moved to next CF 2018-10-01 10:43:00 Michael Paquier (michael-kun) Closed in commitfest 2018-09 with status: Moved to next CF 2018-08-10 22:20:35 Andrew Dunstan (adunstan) Closed in commitfest 2018-07 with status: Moved to next CF 2018-07-02 09:49:08 Etsuro Fujita (efujita) Added efujita as reviewer 2018-04-20 06:07:09 Ashutosh Bapat (ashutoshbapat) Changed authors to Ashutosh Bapat (ashutoshbapat) 2018-04-20 06:06:34 Ashutosh Bapat (ashutoshbapat) Attached mail thread CAFjFpRcz8yoY7cBTYofcrCLwjaDeCcGKyTUivUbRiA57y3v-bw@mail.gmail.com 2018-04-20 06:06:34 Ashutosh Bapat (ashutoshbapat) Created patch record