(fix_expect_after): Don't unconditionally add a timeout pattern.

	Contrary to my belief, a timeout pattern seems to refer to a
	specific spawn id.  If we add it here when there are no
	spawned processes, the timeout will refer to stdin, and this
	will cause expect to detect eof on stdin when run from
	Xenofarm.  Instead, everything that spawns a process must add
	timeout patterns to the expect_active variable.
(l2g_start): Add a timeout pattern to expect_active.
(lyskomd_start): Ditto.
(lyskomd_start_fail): Ditto.
(client_start): Ditto.
(client_start_fail): Ditto.