[system test windows] Rebalance exited with reason {buckets_cleanup_failed

4 nodes in cluster, 4 buckets

Hard Fail Over 172.23.105.39 node in src cluster, add back(Full Recovery) and rebalance

Rebalance exited with reason

{buckets_cleanup_failed,['ns_1@172.23.105.39']}

ns_orchestrator002 ns_1@172.23.105.204 13:35:25 - Tue Jul 28, 2015
Failed to cleanup old buckets on node 'ns_1@172.23.105.39':

{error,eexist} ns_rebalancer000 ns_1@172.23.105.204 13:35:25 - Tue Jul 28, 2015
Unable to rm -rf bucket database directory RevAB{error,eexist}

ns_couchdb_api000 ns_1@172.23.105.39 13:35:25 - Tue Jul 28, 2015
Deleting old data files of bucket "AbRegNums" ns_storage_conf000 ns_1@172.23.105.39 13:35:24 - Tue Jul 28, 2015
Deleting old data files of bucket "MsgsCalls" ns_storage_conf000 ns_1@172.23.105.39 13:35:24 - Tue Jul 28, 2015
Deleting old data files of bucket "RevAB" ns_storage_conf000 ns_1@172.23.105.39 13:35:24 - Tue Jul 28, 2015
Deleting old data files of bucket "UserInfo" ns_storage_conf000 ns_1@172.23.105.39 13:35:24 - Tue Jul 28, 2015
Shutting down bucket "RevAB" on 'ns_1@172.23.105.39' for deletion ns_memcached000 ns_1@172.23.105.39 13:35:04 - Tue Jul 28, 2015
Starting rebalance, KeepNodes = ['ns_1@172.23.105.192','ns_1@172.23.105.204',
'ns_1@172.23.106.57','ns_1@172.23.105.39'], EjectNodes = [], Failed over and being ejected nodes = []; no delta recovery nodes
ns_orchestrator004 ns_1@172.23.105.204 13:35:04 - Tue Jul 28, 2015
Shutting down bucket "MsgsCalls" on 'ns_1@172.23.105.39' for deletion ns_memcached000 ns_1@172.23.105.39 13:35:02 - Tue Jul 28, 2015
Shutting down bucket "AbRegNums" on 'ns_1@172.23.105.39' for deletion ns_memcached000 ns_1@172.23.105.39 13:34:59 - Tue Jul 28, 2015
Shutting down bucket "UserInfo" on 'ns_1@172.23.105.39' for deletion ns_memcached000 ns_1@172.23.105.39 13:34:55 - Tue Jul 28, 2015
Failed over 'ns_1@172.23.105.39': ok ns_rebalancer000 ns_1@172.23.105.204 13:34:54 - Tue Jul 28, 2015
Starting failing over 'ns_1@172.23.105.39' ns_rebalancer000 ns_1@172.23.105.204 13:34:53 - Tue Jul 28, 2015