Add resolve-expressions param to operation read-resource

private void readRecursive(ModelNode modelNode, String modelNodeName, Map<String, Object> map) {
   switch (modelNode.getType()) {
   ...
   case EXPRESSION:
   // this would be great but won't work as it runs in a different jvm
   // ModelNode expression = modelNode.resolve();
   // readRecursive(expression, modelNodeName, map);
   map.put(modelNodeName, modelNode.asString());
   break;
   ...
}