(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.