Allow specification of DocumentRoot when reverse-proxying partially

If any locations are being excluded from reverse-proxying, we need
to be able to specify a DocumentRoot to serve up un-proxied files.

Change-Id: I1c5fe6f73b5983886578975e89c5e4148b506795

manifests/vhost/proxy.pp

@@ -28,6 +28,7 @@ define httpd::vhost::proxy (
     $ssl           = false,
     $vhost_name    = '*',
     $proxyexclusions = undef,
+    $docroot       = undef,
   ) {
 
   include ::httpd

templates/vhost-proxy.conf.erb

@@ -26,6 +26,9 @@ NameVirtualHost <%= @vhost_name %>:<%= @port %>
    ProxyPassReverse / <%= @dest %>/
    ProxyPreserveHost On 
 
+<% if @proxyexclusions != nil and @docroot != nil %>
+   DocumentRoot <%= @docroot %>
+<% end %>
    ErrorLog /var/log/<%= scope.lookupvar("httpd::params::apache_name") %>/<%= @name %>_error.log
    LogLevel warn
    CustomLog /var/log/<%= scope.lookupvar("httpd::params::apache_name") %>/<%= @name %>_access.log combined