topotests: bgp_srv6l3vpn_sid, fix add 'mpls bgp forwarding'

Like it has been done on previous commits, use the inter-AS option B
mechanism to autorise ebgp connection to convey directly MPLS paths
without any MPLS backbone support.

Signed-off-by: Philippe Guibert <[email protected]>

Author: pguibert6WIND

tests/topotests/bgp_srv6l3vpn_sid/r1/bgpd.conf

@@ -17,6 +17,9 @@ log commands
 !debug bgp vpn leak-to-vrf
 !debug bgp vpn rmap-event
 !
+interface eth0
+ mpls bgp forwarding
+!
 router bgp 1 
  bgp router-id 192.0.2.1
  no bgp ebgp-requires-policy

tests/topotests/bgp_srv6l3vpn_sid/r2/bgpd.conf

@@ -18,6 +18,9 @@ log commands
 !debug bgp vpn leak-to-vrf
 !debug bgp vpn rmap-event
 !
+interface eth0
+ mpls bgp forwarding
+!
 router bgp 2
  bgp router-id 192.0.2.2
  no bgp ebgp-requires-policy