code: def find_tracker_url(ticket_url):
      
      if ticket_url.startswith('http://') or ticket_url.startswith('https://'):
          o = urlparse(ticket_url)
          scheme, netloc = o.scheme, o.netloc
      else:
          scheme = 'http'
          (netloc, _) = ticket_url.split('/', 1)
      return '%s://%s' % (scheme, netloc)
docs: Given http://tracker.ceph.com/issues/16673 or
      tracker.ceph.com/issues/16673, return "http://tracker.ceph.com".