code: public static boolean shouldProxy(Properties props) {
      String shouldProxy = props.getProperty(HadoopSecurityManager.ENABLE_PROXYING);
      return shouldProxy != null && shouldProxy.equals("true");
    }
docs: Looks for particular properties inside the Properties object passed in, and determines whether
  proxying should happen or not
  
  @return a boolean value of whether the job should proxy or not