CP-15900: Handle new Tools ISO name
CP-15900: Handle new Tools ISO name

The name of the Tools ISO is going to change from "xs-tools.iso" to
"guest-tools.iso". This patch changes the ISOSR backend to recognise both
names, and set the VDI.name_label accordingly, to simplify the transition.

Signed-off-by: Rob Hoes <rob.hoes@citrix.com>
Reviewed-by: Chandrika Srinivasan <chandrika.srinivasan@citrix.com>

GitHub: closes xapi-project/sm#300

pritha-srivastava/sm,kostaslamda/sm,xapi-project/sm,xapi-project/sm,xapi-project/sm,pritha-srivastava/sm,pritha-srivastava/sm,germanop/sm,chandrikas/sm,germanop/sm,chandrikas/sm,chandrikas/sm,kostaslamda/sm,germanop/sm,kostaslamda/sm