CA-118899: Support UTF-8 iSCSI target names.

Signed-off-by: Rob Dobson <rob@rdobson.co.uk>
Acked-by: Thanos Makatos <thanos.makatos@citrix.co.uk>
Imported-by: Vineeth Raveendran <vineeth.thampi@citrix.com>

(cherry picked from commit 9dbd30cde957ad19ef5ba0e950d15712946975e8)