Allow HOST ID override

[hulto]

Is your feature request related to a problem? Please describe.
Some environments won't require the same level of scrutiny we apply to unique hosts.

Currently we need to write a file which we can't do reliably without elevated permissions on all OSes.

Describe the solution you'd like

Create an override module that evaluates the environment and returns a seeded UUID4. The module should serve as an example to others how they can implement it but will take an environment variable.

If no environment variable var is available should fail over to the file on disk. If an env var is present the on disk file location shouldn't be created.

Describe alternatives you've considered

Additional context