Support Linting YAML as part of Travis CI build (#554)

* add yamllint command to travis CI

installs and runs a linter across the YAML in the
project to ensure consistency in the written YAML.

this uses yamllint and the default yamllint config with
"truthy" and "line-length" disabled.

* run dos2unix on CRLF files

* YAMLLINT: remove trailing spaces

* YAMLLint: add YAML document start

* YAMLLint: too many spaces around bracket

* YAMLLint: fix indentation

* YAMLLint: remove duplicate key

* YAMLLint: newline at end of file

* YAMLLint: Too few spaces after comma

* YAMLLint: too many spaces after colon

hack/debug.yaml

@@ -1,3 +1,4 @@
+---
 # use this pod with: kubectl run ubuntu -it --pid=host  -- /bin/bash
 # this allows you to debug what is running on the host.
 apiVersion: v1
@@ -7,40 +8,40 @@ metadata:
 spec:
   hostPID: true
   containers:
-  - name: ubuntu
-    image: ubuntu
-    command: [ "/bin/bash", "-c", "--" ]
-    args: [ "while true; do sleep 30; done;" ]
-    volumeMounts:
-    - name: var-lib-kubelet
-      mountPath: /var/lib/kubelet
-    - name: etc-systemd
-      mountPath: /etc/systemd
-    - name: etc-kubernetes
-      mountPath: /etc/kubernetes
-      # /usr/bin is mounted to access kubectl / kubelet, for auto-detecting the Kubernetes version. 
-      # You can omit this mount if you specify --version as part of the command.           
-    - name: usr-bin
-      mountPath: /usr/bin
-    - name: kind-bin
-      mountPath: /kind/bin
-    resources:
-      limits:
-        memory: "128Mi"
-        cpu: "500m"
+    - name: ubuntu
+      image: ubuntu
+      command: ["/bin/bash", "-c", "--"]
+      args: ["while true; do sleep 30; done;"]
+      volumeMounts:
+        - name: var-lib-kubelet
+          mountPath: /var/lib/kubelet
+        - name: etc-systemd
+          mountPath: /etc/systemd
+        - name: etc-kubernetes
+          mountPath: /etc/kubernetes
+          # /usr/bin is mounted to access kubectl / kubelet, for auto-detecting the Kubernetes version.
+          # You can omit this mount if you specify --version as part of the command.
+        - name: usr-bin
+          mountPath: /usr/bin
+        - name: kind-bin
+          mountPath: /kind/bin
+      resources:
+        limits:
+          memory: "128Mi"
+          cpu: "500m"
   volumes:
-  - name: var-lib-kubelet
-    hostPath:
-      path: "/var/lib/kubelet"
-  - name: etc-systemd
-    hostPath:
-      path: "/etc/systemd"
-  - name: etc-kubernetes
-    hostPath:
-      path: "/etc/kubernetes"
-  - name: usr-bin
-    hostPath:
-      path: "/usr/bin"
-  - name: kind-bin
-    hostPath:
-      path: "/kind/bin"
+    - name: var-lib-kubelet
+      hostPath:
+        path: "/var/lib/kubelet"
+    - name: etc-systemd
+      hostPath:
+        path: "/etc/systemd"
+    - name: etc-kubernetes
+      hostPath:
+        path: "/etc/kubernetes"
+    - name: usr-bin
+      hostPath:
+        path: "/usr/bin"
+    - name: kind-bin
+      hostPath:
+        path: "/kind/bin"

hack/kind.yaml

@@ -1,3 +1,4 @@
+---
 apiVersion: batch/v1
 kind: Job
 metadata:
@@ -10,41 +11,41 @@ spec:
     spec:
       hostPID: true
       containers:
-      - name: kube-bench
-        image: aquasec/kube-bench:${VERSION}
-        command: ["kube-bench"]
-        volumeMounts:
-        - name: var-lib-etcd
-          mountPath: /var/lib/etcd
-        - name: var-lib-kubelet
-          mountPath: /var/lib/kubelet
-        - name: etc-systemd
-          mountPath: /etc/systemd
-        - name: etc-kubernetes
-          mountPath: /etc/kubernetes
-          # /usr/bin is mounted to access kubectl / kubelet, for auto-detecting the Kubernetes version. 
-          # You can omit this mount if you specify --version as part of the command.           
-        - name: usr-bin
-          mountPath: /usr/bin
-        - name: kind-bin
-          mountPath: /kind/bin
+        - name: kube-bench
+          image: aquasec/kube-bench:${VERSION}
+          command: ["kube-bench"]
+          volumeMounts:
+            - name: var-lib-etcd
+              mountPath: /var/lib/etcd
+            - name: var-lib-kubelet
+              mountPath: /var/lib/kubelet
+            - name: etc-systemd
+              mountPath: /etc/systemd
+            - name: etc-kubernetes
+              mountPath: /etc/kubernetes
+              # /usr/bin is mounted to access kubectl / kubelet, for auto-detecting the Kubernetes version.
+              # You can omit this mount if you specify --version as part of the command.
+            - name: usr-bin
+              mountPath: /usr/bin
+            - name: kind-bin
+              mountPath: /kind/bin
       restartPolicy: Never
       volumes:
-      - name: var-lib-etcd
-        hostPath:
-          path: "/var/lib/etcd"
-      - name: var-lib-kubelet
-        hostPath:
-          path: "/var/lib/kubelet"
-      - name: etc-systemd
-        hostPath:
-          path: "/etc/systemd"
-      - name: etc-kubernetes
-        hostPath:
-          path: "/etc/kubernetes"
-      - name: usr-bin
-        hostPath:
-          path: "/usr/bin"
-      - name: kind-bin
-        hostPath:
-          path: "/kind/bin"
+        - name: var-lib-etcd
+          hostPath:
+            path: "/var/lib/etcd"
+        - name: var-lib-kubelet
+          hostPath:
+            path: "/var/lib/kubelet"
+        - name: etc-systemd
+          hostPath:
+            path: "/etc/systemd"
+        - name: etc-kubernetes
+          hostPath:
+            path: "/etc/kubernetes"
+        - name: usr-bin
+          hostPath:
+            path: "/usr/bin"
+        - name: kind-bin
+          hostPath:
+            path: "/kind/bin"