MPLS Unifom mode

- support both pipe and uniform modes for all MPLS LSP
- all API programming for output-labels requires that the mode (and associated data) is specificed
   - API changes in MPLS, BIER and IP are involved
- new DPO [sub] types for MPLS labels to handle the two modes.

Change-Id: I87b76401e996f10dfbdbe4552ff6b19af958783c
Signed-off-by: Neale Ranns <nranns@cisco.com>
diff --git a/src/vnet/srmpls/sr_mpls_steering.c b/src/vnet/srmpls/sr_mpls_steering.c
index 0bd3466..8bb072c 100755
--- a/src/vnet/srmpls/sr_mpls_steering.c
+++ b/src/vnet/srmpls/sr_mpls_steering.c
@@ -301,7 +301,10 @@
 
   if (steer_pl->vpn_label != (u32) ~ 0)
     {
-      vec_add1 (path.frp_label_stack, steer_pl->vpn_label);
+      fib_mpls_label_t fml = {
+	.fml_value = steer_pl->vpn_label,
+      };
+      vec_add1 (path.frp_label_stack, fml);
       path.frp_eos = MPLS_NON_EOS;
     }
 
@@ -480,7 +483,12 @@
       fib_route_path_t *paths = NULL;
 
       if (steer_pl->vpn_label != (u32) ~ 0)
-	vec_add1 (path.frp_label_stack, steer_pl->vpn_label);
+	{
+	  fib_mpls_label_t fml = {
+	    .fml_value = steer_pl->vpn_label,
+	  };
+	  vec_add1 (path.frp_label_stack, fml);
+	}
 
       /* FIB API calls - Recursive route through the BindingSID */
       if (traffic_type == SR_STEER_IPV6)