AuthenticationProviderService gets LDAP attributes
from confService and queries the LDAP server to
find values on user for specified attributes.
Added a Map<String, String> to Credentials named ldapAttrs
and a getLDAPAttributes() and setLDAPAttributes() to
manipulate ldapAttrs on credentials. Once
AuthenticationProviderService gets the values for the
LDAP attributes it sets ldapAttrs on the credentials object.