pgsql: Add notBefore and notAfter to SSL cert info display

Add notBefore and notAfter to SSL cert info display

This adds the X509 attributes notBefore and notAfter to sslinfo
as well as pg_stat_ssl to allow verifying and identifying the
validity period of the current client certificate.

Author: Cary Huang <cary(dot)huang(at)highgo(dot)ca>
Discussion: https://postgr.es/m/182b8565486.10af1a86f158715.2387262617218380588@highgo.ca

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/75ec5e7bec700577d39d653c316e3ae6c505842c

Modified Files
--------------
contrib/sslinfo/Makefile | 2 +-
contrib/sslinfo/meson.build | 1 +
contrib/sslinfo/sslinfo--1.2--1.3.sql | 12 ++++++
contrib/sslinfo/sslinfo.c | 67 +++++++++++++++++++++++++++++
contrib/sslinfo/sslinfo.control | 2 +-
doc/src/sgml/monitoring.sgml | 20 +++++++++
doc/src/sgml/sslinfo.sgml | 30 +++++++++++++
src/backend/catalog/system_views.sql | 4 +-
src/backend/libpq/be-secure-openssl.c | 47 ++++++++++++++++++++
src/backend/utils/activity/backend_status.c | 2 +
src/backend/utils/adt/pgstatfuncs.c | 46 ++++++++++++--------
src/include/catalog/catversion.h | 2 +-
src/include/catalog/pg_proc.dat | 6 +--
src/include/libpq/libpq-be.h | 2 +
src/include/utils/backend_status.h | 2 +
src/test/regress/expected/rules.out | 12 +++---
src/test/ssl/t/001_ssltests.pl | 8 ++--
src/test/ssl/t/003_sslinfo.pl | 14 ++++++
18 files changed, 246 insertions(+), 33 deletions(-)