L2 over MPLS

[support for VPWS/VPLS]
- switch to using dpo_proto_t rather than fib_protocol_t in fib_paths so that we can describe L2 paths
- VLIB nodes to handle pop/push of MPLS labels to L2

Change-Id: Id050d06a11fd2c9c1c81ce5a0654e6c5ae6afa6e
Signed-off-by: Neale Ranns <nranns@cisco.com>
diff --git a/src/vnet/vxlan-gpe/vxlan_gpe.c b/src/vnet/vxlan-gpe/vxlan_gpe.c
index 97bb1b1..462c79a 100644
--- a/src/vnet/vxlan-gpe/vxlan_gpe.c
+++ b/src/vnet/vxlan-gpe/vxlan_gpe.c
@@ -638,7 +638,7 @@
               fib_node_index_t mfei;
               adj_index_t ai;
               fib_route_path_t path = {
-                  .frp_proto = fp,
+                  .frp_proto = fib_proto_to_dpo(fp),
                   .frp_addr = zero_addr,
                   .frp_sw_if_index = 0xffffffff,
                   .frp_fib_index = ~0,