Reschedule netchecker-server in case of HW failure.

Pod opbject is not reschedulable by kubernetes. It means that if node
with netchecker-server goes down, netchecker-server won't be scheduled
somewhere. This commit changes the type of netchecker-server to
Deployment, so netchecker-server will be scheduled on other nodes in
case of failures.

roles/kubernetes-apps/ansible/tasks/netchecker.yml

@@ -5,7 +5,7 @@
   with_items:
     - {file: netchecker-agent-ds.yml.j2, type: ds, name: netchecker-agent}
     - {file: netchecker-agent-hostnet-ds.yml.j2, type: ds, name: netchecker-agent-hostnet}
-    - {file: netchecker-server-pod.yml.j2, type: po, name: netchecker-server}
+    - {file: netchecker-server-deployment.yml.j2, type: po, name: netchecker-server}
     - {file: netchecker-server-svc.yml.j2, type: svc, name: netchecker-service}
   register: manifests
   when: inventory_hostname == groups['kube-master'][0]

roles/kubernetes-apps/ansible/templates/netchecker-server-deployment.yml.j2

@@ -0,0 +1,33 @@
+apiVersion: apps/v1beta1
+kind: Deployment
+metadata:
+  name: netchecker-server
+spec:
+  replicas: 1
+  template:
+    metadata:
+      name: netchecker-server
+      labels:
+        app: netchecker-server
+      namespace: {{ netcheck_namespace }}
+    spec:
+      containers:
+        - name: netchecker-server
+          image: "{{ server_img }}"
+          env:
+          imagePullPolicy: {{ k8s_image_pull_policy }}
+          resources:
+            limits:
+              cpu: {{ netchecker_server_cpu_limit }}
+              memory: {{ netchecker_server_memory_limit }}
+            requests:
+              cpu: {{ netchecker_server_cpu_requests }}
+              memory: {{ netchecker_server_memory_requests }}
+          ports:
+            - containerPort: 8081
+              hostPort: 8081
+          args:
+            - "-v=5"
+            - "-logtostderr"
+            - "-kubeproxyinit"
+            - "-endpoint=0.0.0.0:8081"

roles/kubernetes-apps/ansible/templates/netchecker-server-pod.yml.j2

@@ -1,28 +0,0 @@
-apiVersion: v1
-kind: Pod
-metadata:
-  name: netchecker-server
-  labels:
-    app: netchecker-server
-  namespace: {{ netcheck_namespace }}
-spec:
-  containers:
-    - name: netchecker-server
-      image: "{{ server_img }}"
-      env:
-      imagePullPolicy: {{ k8s_image_pull_policy }}
-      resources:
-        limits:
-          cpu: {{ netchecker_server_cpu_limit }}
-          memory: {{ netchecker_server_memory_limit }}
-        requests:
-          cpu: {{ netchecker_server_cpu_requests }}
-          memory: {{ netchecker_server_memory_requests }}
-      ports:
-        - containerPort: 8081
-          hostPort: 8081
-      args:
-        - "-v=5"
-        - "-logtostderr"
-        - "-kubeproxyinit"
-        - "-endpoint=0.0.0.0:8081"