Explicitly enable access to host DNS from pod/service IPs.
Also fix the Kubernetes health checks to assert number of ready pods to
match expectation, otherwise the check might skip a pod (e.g.
`kube-proxy` one) which is not ready, allowing the test to proceed too
early.
Update DNS test to print more logs on error.
Signed-off-by: Andrey Smirnov <andrey.smirnov@siderolabs.com>
a9551b7caa