This patch adds new tunnel type for MPLS-in-GRE and MPLS-in-UDP. MPLS-in-GRE protocol link: https://tools.ietf.org/html/rfc4023 MPLS-in-UDP protocol link: https://tools.ietf.org/html/rfc7510 Signed-off-by: Xueming Li <xuemingl@mellanox.com> Acked-by: Adrien Mazarguil <adrien.mazarguil@6wind.com> Acked-by: Olivier Matz <olivier.matz@6wind.com> Acked-by: Thomas Monjalon <thomas@monjalon.net>