6bc3847265
The readiness probe and helm test currently rely on the return code of `dig`, which doesn't fail for NXDOMAIN, which means they are not checking that the names are actually resolved. This moves to using `host` instead which does check this. This also removes the checks for kubernetes etcd domain names, since that doesn't get deployed until after coredns. Change-Id: I0b459f52663c936ed4b8b216614c5b4824a0713f