public void addServlet(String name, String pathSpec, ServletHolder holder) {
    addServlet(name, pathSpec, holder, rootWebAppContext);
  }
Add a servlet holder to the rootWebAppContext that is added to the webserver during its initialization.
@param name The name of the servlet (can be passed as null)
@param pathSpec The path spec for the servlet
@param holder The servlet holder to be added to the webAppContext
common/src/java/org/apache/hive/http/HttpServer.java