In stateless SG there is no connection track so TCP packet of any type
should be allowed by SG. This patch adds test which spawns 2 vms,
connected to 2 different networks and the same router. Both vms are
using different stateless SGs. Finally test asserts that packets of any
of the TCP type (syn, ack, syn-ack, psh, rst, fin) sent from one of the
vms can reach second one.
Change-Id: I23a4b282c83101526af05aa309d578aecaef1fa9
32b0f8b7ae