Fix: Check IPv4 and IPv6 IBGP session in LLA/Locpref test

The original version of the test checked only the IPv4 IBGP
session, which resulted in a test failure when there was a
significant difference between IPv4 and IPv6 IBGP session
setup time.

Author: ipspace

tests/integration/bgp.policy/22-locpref-unnumbered.yml

@@ -50,11 +50,17 @@ validate:
     nodes: [ x1, x2 ]
     plugin: bgp_neighbor(node.bgp.neighbors,'dut',intf=node.interfaces[0].ifname)
 
-  ibgp:
-    description: Check IBGP sessions with DUT
+  ibgp_v4:
+    description: Check IPv4 IBGP sessions with DUT
     wait: ibgp_session
     nodes: [ probe ]
-    plugin: bgp_neighbor(node.bgp.neighbors,'dut')
+    plugin: bgp_neighbor(node.bgp.neighbors,'dut',af='ipv4')
+
+  ibgp_v6:
+    description: Check IPv6 IBGP sessions with DUT
+    wait: ibgp_session
+    nodes: [ probe ]
+    plugin: bgp_neighbor(node.bgp.neighbors,'dut',af='ipv6')
 
   pfx_x1_v4:
     description: Check for IPv4 X1 prefix on Probe