Add support for OpenLDAP as implementation for authentication mechanism

OpenLDAP only returns memberof attribute for users when it's specifically requested
in the ldap query as it's considered an "operational attribute".
https://bugzilla.redhat.com/show_bug.cgi?id=1093739
only allow root to connect to db as root

comment out unused rules instead of removing them
Merge pull request #92 from lfu/openldap

Add support for OpenLDAP as implementation for authentication mechanism.
Merge pull request #110 from kbrock/lockdown_postgres

only allow root to connect to db as root
remove bullet
Merge pull request #126 from kbrock/no_silver_bullets

remove bullet