This reverts commit c6c28f4ac522dd8afb457847bca79eee77f78706. Revert "IKEv1 XAuth: Added temporary "initiate_xauth" public method to ike_sa_t. This allows us to initiate an XAuth password authentication exchange after responding to the final message of Main Mode. This change should be reverted once we have a better method to initiate this exchange." This reverts commit 5529dc50477e25df9dd5f3c442bb1521c0baf225.