[enhancement]: add support for Universal Disk Format (UDF) iso data source

[rgl]

Enhancement

Currently we can only supply a Universal Disk Format (UDF) iso to the Azure data source, but that should be generally available to all data sources.

All the places that currently search for iso9660 disks should also look for udf disks.

[holmanb]

... but that should be generally available to all data sources.

All the places that currently search for iso9660 disks should also look for udf disks.

Why? This feature request requires more detail.