Add ProviderObject mixin to the PhysicalServer
Add ProviderObject mixin to the PhysicalServer

With this commit we include the mixin ProviderObjectMixin on the
model because providers like Redfish would like to use the handy

```ruby
server.with_provider_object { |obj| ... }
```

Signed-off-by: Miha Pleško <e42a14dbca5c0965023849a10306da025a317640@xlab.si>

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