target: add inquiry_vendor module param to override LIO-ORG

target: add inquiry_vendor module param to override LIO-ORG

Orabug: 27679431

OL6 iscsi target used IET which presented IET for the inquiry vendor.
OL7 uses LIO iscsi target instead, which presents 'LIO-ORG'.

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

Add target_core_mod parameter inquiry_vendor for target inquiry vendor
string override.  It defaults to original "LIO-ORG " if not set.

(cherry picked from commit 87e9da042f42aa5bef1a76c4ef84989680e1df2e)
Signed-off-by: Kyle Fortin <kyle.fortin@oracle.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>