wordpress: reduce memory_limit from 512M to 64M

Restrict the raised limit to XMLRPC where it is needed.

Author: Krinkle

modules/profile/manifests/wordpress/base.pp

@@ -39,7 +39,7 @@
 
   class { 'php::fpm':
     ini_values_extra => {
-      'memory_limit' => '512M',
+      'memory_limit' => '64M',
     },
   }
 

modules/profile/templates/wordpress/docs/jquery-config.php.erb

@@ -8,3 +8,9 @@ define( 'JQUERY_STAGING_FORMAT', '' );
 define( 'JQUERY_STAGING',        true );
 define( 'JQUERY_STAGING_FORMAT', 'stage.%s' );
 <%- end -%>
+
+// Raise limit to accommodate resource uploads from builder hosts
+// that run the "wordpress-deploy" Grunt task.
+if ( defined( 'XMLRPC_REQUEST' ) ) {
+  @ini_set( 'memory_limit', '512M' );
+}