Cleanup old checks for k8s 1.18 (#7192)

roles/network_plugin/ovn4nfv/templates/ovn-daemonset.yml.j2

@@ -112,13 +112,13 @@ spec:
               command: ["ovn4nfv-k8s", "check_ovn_control_plane"]
             periodSeconds: 3
           livenessProbe:
-            exec: 
+            exec:
               command: ["ovn4nfv-k8s", "check_ovn_control_plane"]
             initialDelaySeconds: 30
             periodSeconds: 7
             failureThreshold: 5
       nodeSelector:
-        {{ 'beta.' if kube_version is version('v1.18.0', '<') }}kubernetes.io/os: "linux"
+        kubernetes.io/os: "linux"
         ovn4nfv-k8s-plugin: ovn-control-plane
       volumes:
         - name: host-run-ovs
@@ -158,7 +158,7 @@ spec:
   template:
     metadata:
       labels:
-        app: ovn-controller 
+        app: ovn-controller
     spec:
       tolerations:
       - operator: Exists
@@ -214,7 +214,7 @@ spec:
               cpu: {{ ovn_controller_cpu_limit }}
               memory: {{ ovn_controller_memory_limit }}
       nodeSelector:
-        {{ 'beta.' if kube_version is version('v1.18.0', '<') }}kubernetes.io/os: "linux"
+        kubernetes.io/os: "linux"
       volumes:
         - name: host-modules
           hostPath:

roles/network_plugin/ovn4nfv/templates/ovn4nfv-k8s-plugin.yml.j2

@@ -482,7 +482,7 @@ spec:
     spec:
       hostNetwork: true
       nodeSelector:
-        {{ 'beta.' if kube_version is version('v1.18.0', '<') }}kubernetes.io/arch: amd64
+        kubernetes.io/arch: amd64
       tolerations:
       - operator: Exists
         effect: NoSchedule
@@ -556,7 +556,7 @@ spec:
       hostNetwork: true
       hostPID: true
       nodeSelector:
-        {{ 'beta.' if kube_version is version('v1.18.0', '<') }}kubernetes.io/arch: amd64
+        kubernetes.io/arch: amd64
       tolerations:
       - operator: Exists
         effect: NoSchedule