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