iscsitarget: add new recipe

iSCSI Enterprise Target is aimed to develop an
open source iSCSI target with professional features,
that works well in enterprise environment under real
workload, and is scalable and versatile enough to meet the
challenge of future storage needs and developments.

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