Set datasource spec.name to metadata.name

[tenstad]

Closes #181

Resolves the following error when doing grr apply grr.jsonnet in the example folder:
Non-200 response from Grafana while applying datasource prometheus: 422 Unprocessable Entity [{"fieldNames":["Name"],"classification":"RequiredError","message":"Required"}]

spec.name seems to be a required datasource field. I think it makes sense to copy the name from metadata, as done with spec.uid.

[malcolmholmes]

Actually, the right way to do this, that we should switch all resource types to follow, is to throw a (clear) error when the metadata/name and spec/uid (etc) do not match.

How does this sound? Fancy doing it?

[tenstad]

Not sure if I follow. spec/uid is currently derived from metadata/name, and they thus match.

Should both spec/name and spec/uid be defind by the user, rather than derived from metadata/name? Additionaly, metadata/name and spec/uid must match?

[tenstad]

I can agree that this might not be the best solution, since the metadata/name in k8s (format inspiration) is more restrictive than Grafana's datasource name. I therefore think the example should be updated instead, adding the spec/name field.

[seb-lean]

what is the resolution for users? How do we avoid this error?