Pick kube-vip interface automatically by default (#238)

* Pick kube-vip interface automatically by default

* molecule: Fix ipv6 scenario

* Choose a more restrictive molecule timeout in CI

molecule/ipv6/overrides.yml

@@ -7,6 +7,11 @@
         # See: https://github.com/flannel-io/flannel/blob/67d603aaf45ef80f5dd39f43714fc5e6f8a637eb/Documentation/troubleshooting.md#Vagrant  # noqa yaml[line-length]
         flannel_iface: eth1
 
+        # In this scenario, we have multiple interfaces that the VIP could be
+        # broadcasted on. Since we have assigned a dedicated private network
+        # here, let's make sure that it is used.
+        kube_vip_iface: eth1
+
         # The test VMs might be a bit slow, so we give them more time to join the cluster:
         retry_count: 45