Tests: Trivial. Define constants once.

Change-Id: Iaf106962598d04708e8740e016d5c55ff35432c9
Signed-off-by: Paul Vinciguerra <pvinci@vinciconsulting.com>
diff --git a/test/vpp_papi_provider.py b/test/vpp_papi_provider.py
index 98fbb2f..95c22dd 100644
--- a/test/vpp_papi_provider.py
+++ b/test/vpp_papi_provider.py
@@ -15,10 +15,7 @@
 
 from hook import Hook
 from vpp_l2 import L2_PORT_TYPE
-
-# from vnet/vnet/mpls/mpls_types.h
-MPLS_IETF_MAX_LABEL = 0xfffff
-MPLS_LABEL_INVALID = MPLS_IETF_MAX_LABEL + 1
+from vpp_ip_route import MPLS_IETF_MAX_LABEL, MPLS_LABEL_INVALID
 
 
 class L2_VTR_OP: