SLIDER-622: fix ZK Integration tests to be more independent and better @ cleaning up
SLIDER-622 warn if the directory is still present after the delete (shutdown race condition problem on NTFS)
SLIDER-637 purge ZKInstance uses in the accumulo and hbase providers
SLIDER-637 rm unneeded test in TestZKIntegration
SLIDER-622 spin for deletion
SLIDER-622 add spin-checks for cluster dir deletion...deals with NTFS problems
SLIDER-622 bypass Haddop APIs and go to commons IO directory delete if the path is file://
SLIDER-622 ensuring unique names for instances in a test