Add a new field spec.rootDeviceHints to the API with sub-fields for
different types of hints based on what Ironic supports today.

Add a new field status.rootDeviceHints to record the values used when
provisioning the host.

Change the Provisioner API to return the new public struct with the
more detailed device hints so that the values in the hard-coded
profiles can be stored directly in the new status field.

If the user does not provide explicit hints, use the values from the
profile.

Implements https://github.com/metal3-io/metal3-docs/blob/master/design/user-defined-root-device-hints.md

Co-Authored-By: Mika Koskimaki <mika.koskimaki@est.tech>
Co-Authored-By: Doug Hellmann <dhellmann@redhat.com>
Signed-off-by: Doug Hellmann <dhellmann@redhat.com>

Add a missing reference to the hardwareProfile in the spec section so
that we can include a deprecation warning.

Add missing fields in the provisioning status section so that we can
extend it with the root device hints field.

Signed-off-by: Doug Hellmann <dhellmann@redhat.com>

The default for ironic is to treat the value as an exact match, but we
want to use it as a minimum value. Rename the field and update the
code that produces the map to send to the ironic API to always add the
'>=' operator.

Signed-off-by: Doug Hellmann <dhellmann@redhat.com>

Instead of relying on ironic's default behavior, pass explicit
operators with each hint.

Signed-off-by: Doug Hellmann <dhellmann@redhat.com>