Basic pluto test of transport mode.

A single transport mode SA is created between west and east, for port 3.
On west, firewalling makes sure that one can only access port 3 via IPsec.

inetd is started on east, listening on port 2 and 3, spitting out some stuff.
This is tested with 'telnet | wc'.

Due to the way that KLIPS intercepts traffic, routing for a single
port/protocol results in capturing all of the data to that host, so we need
to write a pass route as well.

A latent bug permitted pluto to "--up" a type=passthrough conn, so this
is also tested in west.