title: How to check if webdriver (Using selenium grid) instance is available and reachable
body: <p>I see this error in my test logs:
  WebDriverException: Session [id] was terminated due to FORWARDING_TO_NODE_FAILED.</p>
  
  <p>I am using webdriver with grid configuration {HUB is in Boston and node is in London}</p>
  
  <p>How to check if my driver instance is reachable ?
  Using (null != driver) does not handle this case.</p>