Cleanup expected exception stack trace in logs

1) Expected exception stack trace is logged at warning level.
   This causes the monitoring system(EKG) to pickup these stack traces.
   Do not log these stack trace unless debug is enabled or if the
   exception has inner exception
2) When a node is unavailable in the resource pool map, ignore the
   cleanup. This can happen because the resource pool map used by
   the failure detector and the other requests are different.