local driver disks added by TUI are not automatically installed on host

[ydirson]

There is a big discrepancy in handling of local driver disks by the TUI: any driver disk of type "local" that was installed in the installer environment does not by default get installed on the host, whereas any of type "url" will.

Possible options include:

1. notifying the user that they will need to add them using the "supplemental packs" dialog too
2. explicitly request the user to insert each driver disks at the end of main product installation
3. cache the driver disk contents in the installer's ramdisk environment, as they are typically quite small (and a caching limit could be used, falling back to 1. or 2. if needed)