WIP: app.py, cli.py: Make bst init take an argument

Alexandru Fazakasrequested to merge
AlexFazakas/buildstream:AlexFazakas/add-directory-argument-bst-init into master

Allow bst init to take a directory as an argument.

Changes proposed in this merge request:

  • Adding an optional argument to the bst init command.

This merge request, when approved, will close issue/bug: #702 (closed)

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