shared.unattended: Add package sg3_utils

sg3_utils is requried by scsi_testsuite test,
so include it in unattended install files.
Signed-off-by: NXu Tian <xutian@redhat.com>
Acked-by: NXiaoqing Wei <xwei@redhat.com>
Signed-off-by: NQingtang Zhou <qzhou@redhat.com>