[kube-router] set version to 2.0.0 (#10503)

Signed-off-by: Boris Barnier <bozzo@users.noreply.github.com>

inventory/sample/group_vars/k8s_cluster/k8s-net-kube-router.yml

@@ -1,4 +1,10 @@
-# See roles/network_plugin/kube-router//defaults/main.yml
+# See roles/network_plugin/kube-router/defaults/main.yml
+
+# Kube router version
+# Default to v2
+# kube_router_version: "v2.0.0"
+# Uncomment to use v1 (Deprecated)
+# kube_router_version: "v1.6.0"
 
 # Enables Pod Networking -- Advertises and learns the routes to Pods via iBGP
 # kube_router_run_router: true