Rewrite the LAG integration tests

Integration tests should contain the minimum topology required to
test an individual feature to simplify the troubleshooting. Ideally,
they would contain a single device under test and another 'standard'
device to test device interworking.

Finally, it's always better to hop-by-hop control-plane features (for
example, OSPF adjacency) than end-to-end pings.

tests/integration/lag/01-l3-lag.yml

@@ -1,36 +1,25 @@
 ---
 message: |
-  The devices under test are a pair of routers with a L3 LAG link between them
-  h1 and h2 should be able to ping each other
+  The device under is a router with a L3 LAG link connected to a FRR device. The
+  devices should be able to establish an OSPF adjacency.
+
 groups:
-  _auto_create: True
-  hosts:
-    members: [ h1, h2 ]
-    device: linux
-    provider: clab
   switches:
-    members: [ r1,r2,r3 ]
+    members: [ dut, xr ]
     module: [ lag, ospf ]
 
+nodes:
+  dut:
+  xr:
+    device: frr
+
 links:
-- lag.members: [r1-r2,r1-r2]
-- lag.ifindex: 0 # Name it as 'bond0' -> First one becomes 'bond1'
-  lag.members: 
-  - r2:
-      ifindex: 3
-    r3:
-      ifindex: 3
-  - r2:
-      ifindex: 4
-    r3:
-      ifindex: 4
-- h1-r1
-- r3-h2
+- lag.members: [ dut-xr, dut-xr ]
 
 validate:
-  ping:
-    description: Pinging H2 from H1
-    nodes: [ h1 ]
-    wait_msg: Waiting for STP to enable the ports
-    wait: 45
-    plugin: ping('h2')
+  adj:
+    description: Check OSPF adjacencies
+    wait_msg: Waiting for OSPF adjacency process to complete
+    wait: 50
+    nodes: [ xr ]
+    plugin: ospf_neighbor(nodes.dut.ospf.router_id)

tests/integration/lag/02-lag-vlan-trunk.yml

@@ -0,0 +1,40 @@
+---
+message: |
+  The device under test is a layer-2 switch connected with a LAG VLAN trunk to
+  another layer-2 switch. Host in the same VLAN should be able to ping each
+  other.
+groups:
+  _auto_create: True
+  hosts:
+    members: [ h1, h2, h3, h4 ]
+    device: linux
+    provider: clab
+  switches:
+    members: [ dut, xs ]
+    module: [ lag, vlan ]
+  probe:
+    members: [ xs ]
+    device: frr
+
+vlans:
+  v1:
+    links: [ dut-h1, xs-h2 ]
+  v2:
+    links: [ dut-h3, xs-h4 ]
+
+links:
+- vlan.trunk: [ v1, v2 ]
+  lag.members: [ dut-xs, dut-xs ]
+
+validate:
+  ping_v1:
+    description: Pinging H2 from H1 on VLAN v1
+    nodes: [ h1 ]
+    wait_msg: Waiting for STP to enable the ports
+    wait: 45
+    plugin: ping('h2')
+  ping_v2:
+    description: Pinging H4 from H3 on VLAN v2
+    wait: 10
+    nodes: [ h3 ]
+    plugin: ping('h4')