[maven-release-plugin] copy for tag dnet-hadoop-service-2.4.0
added new rmi methods: deleteHdfsPath, createHdfsDirectory added blackboard action: DELETE_HDFS_PATH
introduced batch delete blackboard action, allowing to consume an epr containing Rows to delete on an hbase table
making spring happy
refactored blackboard actions
updating to major release of ServiceLocator
fixed init
cleanup. Making cluster interaction lazy initialized
allow to enable/disable all the available clients for each cluster