(#22789) Add vserver_host in physical_types

[tampakrap]

virtual => vserver_host was incorrectly shown as is_virtual => true
Adding it to physical_types variable so as it is properly shown as is_virtual => false

[puppetcla]

CLA signed by all contributors.

[adrienthebo]

Thank you very much for this contribution!

Since this is a backwards compatible bugfix, it should probably be targeted against stable. Right now Github doesn't permit changing the target branch for a pull request so we'll need to manually merge this against stable.

Since this is a behavior change that fixes a bug, we would like this pull request to include tests. This helps ensure that the change does what we expect and will help prevent regressions in the future. We have existing tests like https://github.com/puppetlabs/facter/blob/stable/spec/unit/virtual_spec.rb#L435 that could be copied and modified for this change, is this something you would be comfortable doing?

[tampakrap]

Added tests, and confirmed that the second one returns Failure in the previous state

[adrienthebo]

summary: merged into stable in 303d3ed and merged up into master in 303d3ed; this should be released into 1.7.4 and 2.0.0. Thanks again for the contribution!