Apply linux node selector to coreDNS deployment (#3688)

* Apply linux node selector to coreDNS deployment

* Remove comment before linux node selector on manifests

* mend

roles/kubernetes-apps/ansible/templates/coredns-deployment.yml.j2

@@ -27,6 +27,8 @@ spec:
 {% if kube_version is version('v1.11.1', '>=') %}
       priorityClassName: system-cluster-critical
 {% endif %}
+      nodeSelector:
+        beta.kubernetes.io/os: linux
       serviceAccountName: coredns
       tolerations:
         - key: node-role.kubernetes.io/master

roles/kubernetes-apps/ansible/templates/kubedns-autoscaler.yml.j2

@@ -31,7 +31,6 @@ spec:
 {% if kube_version is version('v1.11.1', '>=') %}
       priorityClassName: system-cluster-critical
 {% endif %}
-      # When having win nodes in cluster without this patch, this pod cloud try to be created in windows
       nodeSelector:
         beta.kubernetes.io/os: linux
       tolerations:

roles/kubernetes-apps/ansible/templates/kubedns-deploy.yml.j2

@@ -30,7 +30,6 @@ spec:
 {% if kube_version is version('v1.11.1', '>=') %}
       priorityClassName: system-cluster-critical
 {% endif %}
-      # When having win nodes in cluster without this patch, this pod cloud try to be created in windows
       nodeSelector:
         beta.kubernetes.io/os: linux
       tolerations:

roles/kubernetes-apps/ansible/templates/netchecker-agent-ds.yml.j2

@@ -18,7 +18,6 @@ spec:
       tolerations:
         - effect: NoSchedule
           operator: Exists
-      # When having win nodes in cluster without this patch, this pod cloud try to be created in windows
       nodeSelector:
         beta.kubernetes.io/os: linux
       containers:

roles/kubernetes-apps/ansible/templates/netchecker-agent-hostnet-ds.yml.j2

@@ -13,7 +13,6 @@ spec:
         app: netchecker-agent-hostnet
     spec:
       hostNetwork: True
-      # When having win nodes in cluster without this patch, this pod cloud try to be created in windows
       nodeSelector:
         beta.kubernetes.io/os: linux
 {% if kube_version is version('v1.6', '>=') %}