pgsql: Improve connection denied error message during recovery.

Improve connection denied error message during recovery.

Previously when an archive recovery or a standby was starting and
reached the consistent recovery state but hot_standby was configured
to off, the error message when a client connectted was "the database
system is starting up", which was needless confusing and not really
all that accurate either.

This commit improves the connection denied error message during
recovery, as follows, so that the users immediately know that their
servers are configured to deny those connections.

- If hot_standby is disabled, the error message "the database system
is not accepting connections" and the detail message "Hot standby
mode is disabled." are output when clients connect while an archive
recovery or a standby is running.

- If hot_standby is enabled, the error message "the database system
is not yet accepting connections" and the detail message
"Consistent recovery state has not been yet reached." are output
when clients connect until the consistent recovery state is reached
and postmaster starts accepting read only connections.

This commit doesn't change the connection denied error message of
"the database system is starting up" during normal server startup and
crash recovery. Because it's still suitable for those situations.

Author: James Coleman
Reviewed-by: Alvaro Herrera, Andres Freund, David Zhang, Tom Lane, Fujii Masao
Discussion: https://postgr.es/m/CAAaqYe8h5ES_B=F_zDT+Nj9XU7YEwNhKhHA2RE4CFhAQ93hfig@mail.gmail.com

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/df9384492b89aac370ab9d12eb89375aeb38a1d4

Modified Files
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src/backend/postmaster/postmaster.c | 19 ++++++++++++++++---
src/include/libpq/libpq-be.h | 7 ++++++-
2 files changed, 22 insertions(+), 4 deletions(-)