Add support for Kubernetes Pod annotations

Variable `kubernetes_pod_annotations` will add annotations to Kubernetes pods

installer/roles/kubernetes/templates/deployment.yml.j2

@@ -104,6 +104,12 @@ spec:
 {% endif %}
   template:
     metadata:
+{% if kubernetes_pod_annotations is defined %}
+      annotations:
+{% for key, value in kubernetes_pod_annotations.items() %}
+        {{ key }}: {{ value }}
+{% endfor %}
+{% endif %}
       labels:
         name: {{ kubernetes_deployment_name }}-web-deploy
         service: django