Be a bit more explicit about the plugin generation

ianw · ianw · commit e8177a5412da · 2016-04-11T11:45:02.000+10:00
Make the warning in the auto-generated file stand-out a bit more, so
people don't waste time trying to add entries that appear
automatically.

Change-Id: Icf4290e1fad21ce72af54c178bafcce0b287cdf6
diff --git a/data/devstack-plugins-registry.header b/data/devstack-plugins-registry.header
@@ -1,20 +1,23 @@
 ..
-  Note to patch submitters: this file is covered by a periodic proposal
-  job.  You should edit the files data/devstack-plugins-registry.footer
-  data/devstack-plugins-registry.header instead of this one.
+
+  Note to patch submitters:
+
+  # ============================= #
+  # THIS FILE IS AUTOGENERATED !  #
+  # ============================= #
+
+  ** Plugins are found automatically and added to this list **
+
+  This file is created by a periodic proposal job.  You should not
+  edit this file.
+
+  You should edit the files data/devstack-plugins-registry.footer
+  data/devstack-plugins-registry.header to modify this text.
 
 ==========================
  DevStack Plugin Registry
 ==========================
 
-Since we've created the external plugin mechanism, it's gotten used by
-a lot of projects. The following is a list of plugins that currently
-exist. Any project that wishes to list their plugin here is welcomed
-to.
-
-Detected Plugins
-================
-
-The following are plugins that a script has found in the openstack/
-namespace, which includes but is not limited to official OpenStack
-projects.
+The following list is an automatically-generated collection of
+available DevStack plugins.  This includes, but is not limited to,
+official OpenStack projects.
