Made parse optional in tail input plugin

Change-Id: I93d7a6177cd7e89f4aa5a4f33b3c1088b12896c0
diff --git a/fluentd/files/input/tail.conf b/fluentd/files/input/tail.conf
index b836521..af3a38c 100644
--- a/fluentd/files/input/tail.conf
+++ b/fluentd/files/input/tail.conf
@@ -16,10 +16,12 @@
 {%- if values.get('exclude_path') %}{# Replace 'for-if-else' with 'tojson' after updating to jinja 2.9 #}
   exclude_path [{%- for path in values.exclude_path %}"{{ path }}"{{ ", " if not loop.last else '' }} {%- endfor %}]
 {%- endif %}
+{%- if values.get('parser') %}
   <parse>
 {%- with values=values.get('parser') %}
     @type {{ values.get('type') }}
 {% include 'fluentd/files/parser/' + values.get('type') + '.conf' %}
 {%- endwith %}
   </parse>
-</source>
\ No newline at end of file
+{%- endif %}
+</source>