cfid-1544 Move LDAP Config to UAA

Authentication is moving from Login server to the UAA. 
As such, so is the configuration.
This PR, is backwards compatible. For LDAP configuration that is defined as login. properties, it will inherit it, and read those properties in.
References:
https://www.pivotaltracker.com/story/show/71800286
https://www.pivotaltracker.com/story/show/70410348