Revert "Well, if you make something no longer be NO, it must be made YES. There is"

This reverts commit d336fbaf8f33b33bfa27fe2349a56c17a0ab68e3.
Revert "Stop disabling the NONE cypher in SSH, so we can use it for lower-overhead"

This reverts commit d82c17b28e8575ca177748eaca035ef3fe58a6b6.