On both Mac and Windows we have one well-known port and a SOCKS-like
port to tunnel connections through it. This was necessary on Windows
where ports have well-known GUIDs, but we might as well do it the same
way on both platforms for consistency.
This patch removes the dynamic binding of vsock ports, which fails on
a Windows Moby anyway.
Signed-off-by: David Scott <dave.scott@docker.com>