Defining one default profile for all streams

[LorbusChris]

For modules that release new streams frequently, it would be useful to allow for one default profile for all streams, so the new streams wouldn't have to be added to the defaults file each time.

Example:

document: modulemd-defaults
version: 1
data:
    module: cri-o
    profiles:
        '*': [default]

[sgallagher]

If you use the newer modulemd-packager v3 format you can include a field default: true to any profile that the stream specifies and it will be added automatically to the modulemd-defaults document once built.

That's friendlier to the developer and means that we don't have to change the defaults parser.

[sgallagher]

I just opened https://src.fedoraproject.org/modules/cri-o/pull-request/1 as an example for cri-o. I hope that helps!