(design improvement) Split domain name space

[svenssonaxel]

Qubes OS version: R3.2

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General notes:

There are several problems with the current design of VM names. These include:

• Possible confusion between VM names and keywords, e.g. #2857. This problem can reappear if there is need to introduce new keywords.
• Name clashes between appVMs and dispVMs, see #3383.
• Name clashes between appVMs and internal VMs such as "fedora-XX-dvm".
• Direct mapping to xen domain names exposes the system to possibl xen-specific naming issues (I've had an issue with this, will update if I can reproduce it).

Perhaps consider introducing a way to divide the namespace in non-overlapping classes, for example

• sys- prefix for service VMs
• _ prefix for appVMs, maybe for templates too
• disp prefix for dispVMs
• new keywords can be created at will that do not interfere with any prefix
  However an actual change would have to be worked out a lot more carefully than this example.