[check_postgres] Fix for the connection action

[Guillaume Lelarge]

Hi,

Right now, if we try to check the connection for two databases, if the
second one doesn't work, check_postgres reports the error for the first
one:

$ LANG=C ./check_postgres.pl --action=connection -db postgres,template0
FATAL:  database "template0" is not currently accepting connections
Use of uninitialized value in join or string at ./check_postgres.pl line
1610.
POSTGRES_CONNECTION CRITICAL: DB "postgres"  | time=0.01s

So here is a fix that checks the connection for each database, and
reports correctly success and failure.

I will apply it in a few days if there is no objection.

Regards.


-- 
Guillaume
  http://blog.guillaume.lelarge.info
  http://www.dalibo.com
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