Revert "Bump coredns to 1.7.1"

This reverts commit 5753d477df.

Signed-off-by: Brad Davidson <brad.davidson@rancher.com>

manifests/coredns.yaml

@@ -58,11 +58,11 @@ data:
         ready
         kubernetes %{CLUSTER_DOMAIN}% in-addr.arpa ip6.arpa {
           pods insecure
+          upstream
           fallthrough in-addr.arpa ip6.arpa
         }
         hosts /etc/coredns/NodeHosts {
-          ttl 60
-          reload 15s
+          reload 1s
           fallthrough
         }
         prometheus :9153
@@ -95,7 +95,6 @@ spec:
       labels:
         k8s-app: kube-dns
     spec:
-      priorityClassName: "system-cluster-critical"
       serviceAccountName: coredns
       tolerations:
         - key: "CriticalAddonsOnly"
@@ -107,7 +106,7 @@ spec:
         beta.kubernetes.io/os: linux
       containers:
       - name: coredns
-        image: rancher/coredns-coredns:1.7.1
+        image: rancher/coredns-coredns:1.6.9
         imagePullPolicy: IfNotPresent
         resources:
           limits:

scripts/airgap/image-list.txt

@@ -1,4 +1,4 @@
-docker.io/rancher/coredns-coredns:1.7.1
+docker.io/rancher/coredns-coredns:1.6.9
 docker.io/rancher/klipper-helm:v0.3.0
 docker.io/rancher/klipper-lb:v0.1.2
 docker.io/rancher/library-busybox:1.31.1