The define cinder::backend::hp3par_iscsi and
cinder::backend::hp3par_iscsi are deprecated and are now
being removed in Ocata cycle, pleasse use the new define
cinder::backend::hpe3par_iscsi.
Also remove all tests releated to hp3par.
Change-Id: I63d5349480021e363d7c12ac3c260935c1a2272a