[SCSI] iscsi class: fix vlan configuration

Userspace was sending the priority/id part of the vlan tag
and sysfs was displaying the id in the vlan file. This
renames the vlan sysfs file to vlan_id to reflect that it
was showing the id and to match the vlan_priority file.
This also adds a ISCSI_NET_PARAM_VLAN_TAG iscsi nl command
to relfect that we are sending down the vlan/priority
part of the tag.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
diff --git a/include/scsi/iscsi_if.h b/include/scsi/iscsi_if.h
index 706a1bb..2703e3b 100644
--- a/include/scsi/iscsi_if.h
+++ b/include/scsi/iscsi_if.h
@@ -311,10 +311,11 @@
 	ISCSI_NET_PARAM_VLAN_ID			= 13,
 	ISCSI_NET_PARAM_VLAN_PRIORITY		= 14,
 	ISCSI_NET_PARAM_VLAN_ENABLED		= 15,
-	ISCSI_NET_PARAM_IFACE_TYPE		= 16,
-	ISCSI_NET_PARAM_IFACE_NAME		= 17,
-	ISCSI_NET_PARAM_MTU			= 18,
-	ISCSI_NET_PARAM_PORT			= 19,
+	ISCSI_NET_PARAM_VLAN_TAG		= 16,
+	ISCSI_NET_PARAM_IFACE_TYPE		= 17,
+	ISCSI_NET_PARAM_IFACE_NAME		= 18,
+	ISCSI_NET_PARAM_MTU			= 19,
+	ISCSI_NET_PARAM_PORT			= 20,
 };
 
 enum iscsi_conn_state {