Updates to Delete Emtpty Directory Action ------ OODT-730

git-svn-id: https://svn.apache.org/repos/asf/oodt/trunk@1615496 13f79535-47bb-0310-9956-ffa450edef68
Updates to SFTP protocol delete and resources ------ OODT-730

git-svn-id: https://svn.apache.org/repos/asf/oodt/trunk@1615497 13f79535-47bb-0310-9956-ffa450edef68