Doc:Create a new header for integration plugins

Integration plugins need a different header. For example, the plugin docs should
to point to the integration repo rather than the input, output, filter, or codec
repo. The new header also includes boilerplate text to indicate that the individual
plugin is part of an integration rather than stand-alone. This work implements needed
changes.

docs/include/plugin_header-integration.asciidoc

@@ -0,0 +1,39 @@
+ifeval::["{versioned_docs}"!="true"]
+[subs="attributes"]
+++++
+<titleabbrev>{plugin}</titleabbrev>
+++++
+endif::[]
+ifeval::["{versioned_docs}"=="true"]
+[subs="attributes"]
+++++
+<titleabbrev>{version}</titleabbrev>
+++++
+endif::[]
+
+* A component of the <<plugins-integrations-{plugin},{plugin} integration plugin>> 
+* Integration version: {version}
+* Released on: {release_date}
+* {changelog_url}[Changelog]
+
+ifeval::["{versioned_docs}"!="true"]
+
+For other versions, see the
+{lsplugindocs}/{type}-{plugin}-index.html[Versioned plugin docs].
+
+endif::[]
+
+ifeval::["{versioned_docs}"=="true"]
+
+For other versions, see the <<integration-{plugin}-index,overview list>>.
+
+To learn more about Logstash, see the {logstash-ref}/index.html[Logstash Reference].
+
+endif::[]
+
+==== Getting Help
+
+For questions about the plugin, open a topic in the http://discuss.elastic.co[Discuss] forums. 
+For bugs or feature requests, open an issue in https://github.com/logstash-plugins/logstash-integration-{plugin}[Github].
+For the list of Elastic supported plugins, please consult the https://www.elastic.co/support/matrix#matrix_logstash_plugins[Elastic Support Matrix].
+