scsi: be2iscsi: Handle only NET_PARAM in iface_get_param

Wrong settings displayed for iface:
iface.header_digest = 192.168.197.22
iface.data_digest = 255.255.255.0
iface.immediate_data = 192.168.197.1

Process ISCSI_NET_PARAM only in beiscsi_iface_get_param.

Signed-off-by: Jitendra Bhivare <jitendra.bhivare@broadcom.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>