NVP Router: Do no perfom SNAT on E-W traffic

Bug 1130053

This patch ensures 'No Snat' rules are enforced in order to avoid source
natting on east-west traffic.

Change-Id: I967e72e7b6bc8e2763c0fbdf6deeafb43ff27f54
Merge "NVP Router: Do no perfom SNAT on E-W traffic"