Simplify waiting until kubernetes is ready

Wait on the /readyz health endpoint instead of kubectl version, and
remove the wait for coredns.

Signed-off-by: Nir Soffer <nsoffer@redhat.com>

test/drenv/providers/lima/k8s.yaml

@@ -194,21 +194,15 @@ probes:
     hint: |
       The k8s kubeconfig file has not yet been created.
 
-  - description: "kubernetes cluster to be running"
+  - description: "kubernetes cluster to be ready"
     script: |
       #!/bin/bash
       set -eux -o pipefail
-      if ! timeout 300s bash -c "until kubectl version >/dev/null 2>&1; do sleep 3; done"; then
-        echo >&2 "kubernetes cluster is not up and running yet"
+      if ! timeout 600s bash -c "until kubectl get --raw /readyz 2>/dev/null; do sleep 3; done"; then
+        echo >&2 "kubernetes cluster is not ready yet"
         exit 1
       fi
 
-  - description: "coredns deployment to be running"
-    script: |
-      #!/bin/bash
-      set -eux -o pipefail
-      kubectl wait -n kube-system --timeout=180s --for=condition=available deploy coredns
-
 copyToHost:
   - guest: "/etc/kubernetes/admin.conf"
     host: "{{.Dir}}/copied-from-guest/kubeconfig.yaml"