Commit I34d72b12289d6f6527bc114a32dac88281dd2cc4 added NO_DNAT rules
for each router interface. Those rules are not supported and unnecessary
for older NSX versions as VLAN networks were not supported with routers.
This commit adds the NO_DNAT rules only when supported.
Depends-on: I4d99193caac6940911cc071016359a1361428967
Change-Id: Ic0934979931e20645ee1d7d6b5968d7d3efc9c01