services/cluster/vkube: Fix flaky test
services/cluster/vkube: Fix flaky test

After the application update, only look at the new version of the pod.
Sometimes, there is still an old pod in state "Terminating" that we
don't care about.

Example from a failed test: vkube> tunneld-1-cjgp1tunneld-2-hk4jn

Change-Id: I47322d8de45b2ec8c4311dd919756dd161b89b94

vanadium/go.ref,vanadium/go.ref,vanadium/go.ref,vanadium/go.ref,vanadium/go.ref,vanadium/go.ref