Issue a warning if primary config is missing _self_ and is overriding config values

[omry]

Hydra 1.1 changed the default composition order and it turned out more disruptive than initially expected.
To help people migrating be aware of the change, we will issue a warning if the primary config is specifying both a Defaults List and config values and the Defaults List is not specifying `self.

This warning may be removed in Hydra 1.2.

[postrational]

Is it possible to supress this warning in the meanwhile before 1.2 comes out(assuming new app, no hydra 1.0 compatibility needed)?

[Jasha10]

The warning is raised as a UserWarning using python's warnings.warn stdlib function. Here is the relevant code in Hydra. You should be able to suppress this by configuring the warnings filter.