(attach): New constant.

(line_leader): New variable.
(meta_line_leader): New variable.
(l2g_start): Set l2g_id, expect_active and expect_always.
(fix_expect_after): New proc.
(simple_expect): New argument: meta.  Handle line leaders.
	Removed tests for unexpected lines, which should now be handled
	via expect_active.
(unanchored_expect): Added missing quotes.
(lyskomd_start): Handle attach.  Set expect_active and
	expect_always to something sane.
(client_start): Use tcpconnect.py and line leaders to make it
	easier to debug the test cases.  Set expect_active and
	expect_always to something sane.
(talk_to): Handle l2g.  Handle line leaders.  Call fix_expect_after.