new_contents: import netlink.core as netlink
  import netlink.route.capi as capi
  import netlink.route.link as link
  
  sock = netlink.lookup_socket(netlink.NETLINK_ROUTE)
  
  cache = link.LinkCache()
  cache.refill(sock)
  
  testtap1 = cache['testtap1']
  print testtap1
  
  lbr = link.Link()
  lbr.type = 'bridge'
  lbr.name = 'testbridge'
  print lbr
  lbr.add()
  
  cache.refill(sock)
  lbr = cache['testbridge']
  print lbr
  
  lbr.enslave(testtap1)
  cache.refill(sock)
  testtap1 = cache['testtap1']
  
  print capi.rtnl_link_is_bridge(lbr._rtnl_link)
  print capi.rtnl_link_get_master(testtap1._rtnl_link)
  
subject: add python bridge testing sample