Rauf Kuliyev 38b4156a69 [MINOR] checks: add PostgreSQL health check
I have written a small patch to enable a correct PostgreSQL health check
It works similar to mysql-check with the very same parameters.

E.g.:
listen pgsql 127.0.0.1:5432
   mode tcp
   option pgsql-check user pgsql
   server masterdb pgsql.server.com:5432 check inter 10000
2011-01-04 15:14:13 +01:00
..
2010-02-02 11:28:20 +01:00
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2007-05-13 20:19:55 +02:00