OAK-1985 TokenLoginModule can't handle case insensitive userids

- adding test case for external login module

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1612892 13f79535-47bb-0310-9956-ffa450edef68
OAK-1985 TokenLoginModule can't handle case insensitive userids

- adding test case for ldap login module

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1612899 13f79535-47bb-0310-9956-ffa450edef68