Added configuration options and code for optional LDAP functionality to look up user's DN - search for user's DN based on a filter rather than assuming the DN by format string. Updated ldapauth plugin to make a configurable group filter template, and we now pass the group_filter to the info plugin. The info plugin now uses the group_filter if passed in or by default uses the default filter of memberuid=%s where %s is replaced by the username.
Signed-off-by: Kendal Montgomery <kmontgomery@cbuscollaboratory.com>