NVP plugin:fix connectivity to fip from internal nw
The current set of NAT rules configured in the NVP logical router
prevents instances on an internal network from establishing TCP
connections with a floating IP associate with an internal port
on the same Neutron network.
This patch add a SNAT rule to ensure connections coming from the
internal network always appear to the port associate with the
floating IP as coming from the external network.
Change-Id: I12da12ee136c61fddb04f2b216382b51d751a02c
Closes-Bug:
1221419