JSONRPCServiceServlet should use getQueryString() instead of getParameter()

The current JSONRPCServiceServlet uses the following code to handle SMD requests:

if (request.getParameter("smd") != null) {
handleSMDRequest(request, response);
}

With some web containers, a path such as "/HelloWorldService?smd" will result in request.getParameter("smd") returning null since no value is assigned to the parameter. A better way to check would be to use getQueryString():

if ("smd".equalsIgnoreCase(request.getQueryString()))

{ handleSMDRequest(request, response); }