* dbus/dbus-auth.c (client_try_next_mechanism): Remove logic to

 	* dbus/dbus-auth.c (client_try_next_mechanism): Remove logic to
	filter against auth->allowed_mechs; we only add allowed mechs in
	record_mechanisms().

 	* dbus/dbus-auth-script.c (_dbus_auth_script_run): Add an
	ALLOWED_MECHS to auth-script format so we can set the list of
	allowed mechanisms.

 	* data/auth/client-out-of-mechanisms.auth-script: New test to
	check client disconnects when it is out of mechanisms to try.

 	* dbus/dbus-auth.c (process_command): Remove check for lines
	longer that 1 MB; we only buffer up maximum 16 kB.

 	* dbus/dbus-transport.c, dbus/dbus-transport-unix.c,
	dbus/dbus-auth-script.c, dbus/dbus-auth.c, dbus/dbus-auth.h:
	Remove auth state AUTHENTICATED_WITH_UNUSED_BYTES, instead always
	assume there might be unused bytes.

 	* dbus/dbus-auth.c (_dbus_auth_do_work): Remove check for
	client-out-of-mechs, it is handled in process_reject(). Move check
	for max failures to send_rejected(), as it's a server-only thing.