Avoid useless retrieval of defaults and check constraints in pg_dump -a

When Who What
2020-09-16 08:10:17 Michael Paquier (michael-kun) Closed in commitfest 2020-09 with status: Committed
2020-09-11 06:39:19 Michael Paquier (michael-kun) Added michael-kun as committer
2020-09-10 12:31:43 Daniel Gustafsson (d_gustafsson) New status: Ready for Committer
2020-09-03 09:27:58 Daniel Gustafsson (d_gustafsson) Added d_gustafsson as reviewer
2020-07-12 09:12:35 Julien Rouhaud (rjuju) Changed authors to Julien Rouhaud (rjuju)
2020-07-12 09:12:19 Julien Rouhaud (rjuju) Attached mail thread 20200712054850.GA92357@nol
2020-07-12 09:12:19 Julien Rouhaud (rjuju) Created patch record