LIBDRUM-217. Configure Authentication

1. Updated authentication-ldap.cfg to refer ldap authentication settings from the build.properties
2. Updated dspace.cfg to refer ldap authentication settings from the build.properties
4. Updated local.properties template to include ldap settings.
5. Updated local installation document

https://issues.umd.edu/browse/LIBDRUM-217
Merge branch 'drum-develop' of github.com:umd-lib/drum into drum-develop