target: add inquiry_product module param to override LIO default

target: add inquiry_product module param to override LIO default

Orabug: 27679431

OL6 iscsi target used IET which presented VIRTUAL-DISK for inquiry product.
OL7 uses the LIO iscsi target instead, which presented LIO iblock name.

Exadata targets upgrading from OL6 to OL7 need to present the same
product ID to existing iscsi initiator multipath mappings.

Add target_core_mod parameter inquiry_product for target inquiry vendor
string override.  It defaults to LIO iblock name.

The user will also need to do one of the following in targetcli:
	set global export_backstore_name_as_model=false
or for each backstore:
	/backstores/<type>/<name> set attribute emulate_model_alias=0

(cherry picked from commit faf91b95fd22dbf0a1a7fd5b18ab71a929385927)
Signed-off-by: Kyle Fortin <kyle.fortin@oracle.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>