- import tracks when connection procedure started. if connection error happens

  after HZ then ptlrpc_connect_interpret() starts reconnection immediately.
  this speeds recovery up a bit
- pinger pings inter-mds connection more ofter then usual ones
- pinger finds the most sooner event and waits for it, not for obd_timeout * 2
- mds_getattr_name() needs not to check whether mds is choosen right if
  attrs are requested by fid