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WIP: Version workspaces.yml

Antoine Wacheux requested to merge bloomberg/bst/buildstream:versioned_yaml into master

This change introduce versioning for workspaces.yml

It adds the _versioned_structure.py component that can be used to version structures. In a nutshell, versioned_structure exposes the convert_structure function. This function makes sure that the format of any structure passed comply with the last format that BuildStream handle, either by converting it if necessary or raising an error when backward compatibility is not guaranteed anymore.

This convert_structure function is used to introduce versioning to workspaces.yml.

The format has been changed from

element: workspace_path

to

version: 1
element:
    path: workspace_path

The actual workspaces.yml version is assumed to be 0 and the convert_structure function convert files from version 0 to version 1 automatically.

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