Fix NVP FWaaS errors when creating firewall without policy

Change-Id: I7ced6fe91a2d27c3739c54aa90489976532b3ecc
Closes-Bug: #1282366
Support advanced NVP IPsec VPN Service

The patch adds NVP advanced IPsec VPN Service support for NVP with VCNS:
    * NVP IPsec VPN is an  advanced Service depending on NVP
      advanced service router
    * NVP IPsec VPN Service will finally call VCNS IPsec VPN bulk
      reconfiguration to map to VPN DB logic

Implements: blueprint nvp-vpnaas-plugin
Change-Id: Ic8a96f5defc2b868c6f18fb4966b04079d3c781a
Merge "Fix NVP FWaaS errors when creating firewall without policy"
Merge "Support advanced NVP IPsec VPN Service"