pgsql: pg_dumpall: Fix handling of conflicting options.

pg_dumpall: Fix handling of conflicting options.

pg_dumpall is missing checks for some conflicting options,
including those passed through to pg_dump. To fix, introduce a
new function that checks whether mutually exclusive options are
set, and use that in pg_dumpall. A similar change could likely be
made for pg_dump and pg_restore, but that is left as a future
exercise.

This is arguably a bug fix, but since this might break existing
scripts, no back-patch for now.

Author: Jian He <jian(dot)universality(at)gmail(dot)com>
Co-authored-by: Nathan Bossart <nathandbossart(at)gmail(dot)com>
Reviewed-by: Wang Peng <215722532(at)qq(dot)com>
Reviewed-by: Zsolt Parragi <zsolt(dot)parragi(at)percona(dot)com>
Reviewed-by: Chao Li <li(dot)evan(dot)chao(at)gmail(dot)com>
Discussion: https://postgr.es/m/CACJufxFf5%3DwSv2MsuO8iZOvpLZQ1-meAMwhw7JX5gNvWo5PDug%40mail.gmail.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/b2898baaf7e40a187de5b0134d53d944b38209cd

Modified Files
--------------
src/bin/pg_dump/pg_dumpall.c | 70 +++++++++++++++--------------
src/bin/pg_dump/t/001_basic.pl | 34 +++++++++++++-
src/bin/pg_dump/t/002_pg_dump.pl | 2 -
src/bin/pg_dump/t/005_pg_dump_filterfile.pl | 4 +-
src/fe_utils/option_utils.c | 35 +++++++++++++++
src/include/fe_utils/option_utils.h | 6 +++
6 files changed, 111 insertions(+), 40 deletions(-)