PGAgent 4.0 error feedback

Hi Guys,

I've been testing out PGAgent 4 (build today from master at commit
86ca5c5ed1ad572075ba27e05e4680ebdf5b9feb) to check the connection
handling on error is still fixed with the boost reimplementation
(which it is!)
and noticed a few issues compared to PGAgent 3 around feedback to the
user if the connection string is incorrect.

I've tested with incorrect username and password, user not in the hba,
db doesn't exist, postgresql not running on the host (or incorrect
hostaddr) and 4 seems to always returns the error :
`
ERROR: Couldn't find the function 'pgagent_schema_version' - please
run pgagent_upgrade.sql.
`

whereas 3.4.1 tends to output from the pgconnection itself like:
`
Sat Jun 9 21:32:13 2018 : WARNING: Couldn't create the primary
connection (attempt 1): FATAL: no pg_hba.conf entry for host
"172.30.0.16", user "pgagent_login_role", database
"pgagent_login_role", SSL on
FATAL: no pg_hba.conf entry for host "172.30.0.16", user
"pgagent_login_role", database "pgagent_login_role", SSL off
`

which at least points the user towards the actual error!

Not sure if this is known already, but I thought I'd raise it prior to release.

Thanks,
Rob
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