CASTOR-4740: tapeserverd: DriveGeneric::waitUntilReady() should be based
on SCSI call TEST UNIT READY instead of st driver. Reiplemented drive::DriveGeneric::waitUntilReady to use TEST UNIT READY SCSI command.
on SCSI call TEST UNIT READY instead of st driver. Reiplemented drive::DriveGeneric::waitUntilReady to use TEST UNIT READY SCSI command.