title: Kubectl patch adding extra "-" character
body: <p>I'm trying to use kubectl patch to add an extra annotation to my k8s nginx ingress.</p>
  
  <p>Here's the ingress that I start with:</p>
  
  <pre><code>apiVersion: v1
  items:
  - apiVersion: extensions/v1beta1
    kind: Ingress
    metadata:
      annotations:
        field.cattle.io/publicEndpoints: '[{"stuff:false}]'
        kubernetes.io/ingress.class: nginx-external
      creationTimestamp: "2019-02-25T20:38:29Z"
      generation: 1
  </code></pre>
  
  <p>Here is my patch file that I'm applying <code>ingress_annotation.yaml</code>.</p>
  
  <pre><code>metadata:
    annotations:
      nginx.ingress.kubernetes.io/configuration-snippet: |
        proxy_set_header l5d-dst-override $service_name.$namespace.svc.cluster.local:80;
        proxy_hide_header l5d-remote-ip;
        proxy_hide_header l5d-server-id;
  </code></pre>
  
  <p>I apply this patch by running <code>kubectl patch ingress kibana --patch "$(cat ingress_annotation.yaml)"</code>.</p>
  
  <p>When I apply this it does add the annotation to the ingress looks like this when I run <code>kubectl get ingress &lt;my_ingress&gt; -o yaml</code>:</p>
  
  <pre><code>apiVersion: v1
  items:
  - apiVersion: extensions/v1beta1
    kind: Ingress
    metadata:
      annotations:
        field.cattle.io/publicEndpoints: '[{"Stuff:false}]'
        kubernetes.io/ingress.class: nginx-external
        nginx.ingress.kubernetes.io/configuration-snippet: |-
          proxy_set_header l5d-dst-override $service_name.$namespace.svc.cluster.local:80;
          proxy_hide_header l5d-remote-ip;
          proxy_hide_header l5d-server-id;
      creationTimestamp: "2019-02-25T20:38:29Z"
      generation: 1
  </code></pre>
  
  <p>Note the extra <code>"-"</code> character after <code>nginx.ingress.kubernetes.io/configuration-snippet: |</code>. I'm not sure where this character is coming from or what it's doing here. Can anyone shine some light on this for me, or how I can prevent this character from being added to my annotation?</p>