(#13860) Autorequire Package['httpd']

Previous to this commit, the `a2mod type did not autorequire the
Package['httpd'] resource provided by the `apache` class. If the
Package['httpd'] resource was enforced after any a2mod resources, the
a2mod resources would fail since the httpd package installs the
a2emod/a2dismod system commands.

lib/puppet/type/a2mod.rb

@@ -9,4 +9,8 @@ Puppet::Type.newtype(:a2mod) do
        isnamevar
 
     end
+
+    autorequire(:package) { catalog.resource(:package, 'httpd')}
+
+    end
 end