scsirastools: add new recipe

The scsirastools  were designed to add to the Serviceability of disk
devices under Linux so that the system does not have to be rebooted or taken out
of service to perform common maintenance or service functions. Devices handled
by scsirastools include SCSI, Linux software RAID, SAS, SATA, and USB storage
devices (some via SCSI emulation).

Signed-off-by: Jagadeesh Krishnanjanappa <jkrishnanjanappa@mvista.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>