15850 - add required mco version to metadata

Show the required version in the help output.  Also include the
metadata erb in redhat packaging that was left out before

etc/metadata-help.erb

@@ -8,6 +8,10 @@
      License: <%= meta[:license] %>
      Timeout: <%= meta[:timeout] %>
    Home Page: <%= meta[:url] %>
+<% if requirement = requirements[:mcollective] -%>
+
+   Requires MCollective <%= requirement %> or newer
+<% end -%>
 <% unless @usage == "" -%>
 
 <%= Util.align_text(@usage, nil, 3) if @usage != "" %>

ext/redhat/mcollective.spec

@@ -67,6 +67,7 @@ rm -rf %{buildroot}
 %{__install} -m0444 etc/rpc-help.erb %{buildroot}%{_sysconfdir}/mcollective/rpc-help.erb
 %{__install} -m0444 etc/data-help.erb %{buildroot}%{_sysconfdir}/mcollective/data-help.erb
 %{__install} -m0444 etc/discovery-help.erb %{buildroot}%{_sysconfdir}/mcollective/discovery-help.erb
+%{__install} -m0444 etc/metadata-help.erb %{buildroot}%{_sysconfdir}/mcollective/metadata-help.erb
 %if 0%{?suse_version}
 %{__install} -m0755 mcollective.init %{buildroot}%{_sysconfdir}/init.d/mcollective
 %else

website/reference/plugins/ddl.md

@@ -51,6 +51,15 @@ metadata :name        => "SimpleRPC Service Agent",
 
 It's fairly obvious what these all do, *:timeout* is how long the MCollective daemon will let the threads run.
 
+## Required versions
+As of MCollective 2.1.2 you can indicate which is the lowest version of MCollective needed to use a plugin.  Plugins that do not meet the requirement can not be used.
+
+{% highlight ruby linenos %}
+requires :mcollective => "2.0.0"
+{% endhighlight %}
+
+You should add this right after the metadata section in the DDL
+
 ## Actions, Input and Output
 Defining inputs and outputs is the hardest part, below first the *status* action: