setup.py: remove sgio.test from packages, we no longer use/have it

Signed-off-by: Ronnie Sahlberg <ronniesahlberg@gmail.com>
scsi_device.py: add iSCSI support using libiscsi-python module

If/when the libiscsi-python module is available, this patch brings
iSCSI support to python-scsi.

iSCSI resources are specified using iSCSI URLs :

iscsi://<server>/<target iqn>/<lun>

Signed-off-by: Ronnie Sahlberg <ronniesahlberg@gmail.com>
Merge branch 'setup' of https://github.com/sahlberg/python-scsi into sahlberg-setup

Conflicts:
	sgio/pyscsi/scsi_device.py
fixed merge conflict in scsi_device.py
Merge branch 'sahlberg-setup'