Enhanced Group VPNv2 member features

Group VPNv2 member features have been enhanced to include the following:

• Accept group domain of interpretation (GDOI) push messages from Cisco group controller/key server (GC/KS) as per RFC 6407.
• Support for group associated policy (GAP) payload, including activation time delay (ATD) and deactivation time delay (DTD), in push messages from Cisco GC/KS as per RFC 6407.
• Support standardized push ACK messages from MX Series group member router to Cisco GC/KS as per IETF draft RFC
• http://www.ietf.org/id/draft-weis-gdoi-rekey-ack-00.txt
•  IP Delivery Delayed Detection Protocol. Time-based anti-replay protection for Group VPNv2 data traffic on MX Series group member routers as per IETF draft RFC
• http://tools.ietf.org/html/draft-weis-delay-detection-00
• Support for SHA-256 HMAC algorithm for authentication.
• Support partial fail open for business-critical traffic.
• Support for control-plane debug traces per member IP address and server IP address.
• Same gateway for multiple groups, wherein the same local and remote address pair is used for multiple groups.