fix(logger): change wildcard syntax

The wildcard syntax is incorrect. The proper syntax is ":omusrmsg:*". See
http://lists.adiscon.net/pipermail/rsyslog/2012-October/030846.html
fix(logger): unload psql module

This module is currently unused in the logger.

fixes #678
Merge pull request #693 from opdemand/fix-logger

fix(logger): fix wildcard syntax; unload psql module