Add lisp-gpe ip6 data-plane support

The implementation mimics that of the ip4 data-plane. Therefore, a new
lgpe-ip6-lookup lookup node is introduced for ip6 source lookups, a
lisp-gpe-ip6-input node for decapsulating ip6 encapsulated packets and
the tx function of the lisp-gpe interface is updated to support any mix
of v4 and v6 in underlay and overlay.

Change-Id: Ib3a6e339b8cd7618a940acf0dd8e61c042fd83dd
Signed-off-by: Florin Coras <fcoras@cisco.com>
12 files changed