Condition for missing rootDeviceHints of HetznerBareMetalHost

[janiskemper]

/kind feature

Describe the solution you'd like
The user has to specify rootDeviceHints of HetznerBareMetalHosts. Currently, no condition shows the user that rootDeviceHints are still missing.

I propose to add a condition that shows whether rootDeviceHints are existing (and valid) or not. This condition can be set on true or false independent of the provisioning of a machine. It is maybe necessary to distinguish rootDeviceHints that are set from those that are validated, because if the controller hasn't gotten the information about the storage devices from the machine yet, then the rootDeviceHints cannot be validated yet.