Factorize setup.py files

All setup.py files of SWH are very similar. Their content should be moved to swh.core.

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Migrated from T1245 (view on Phabricator)

added Core & foundations Easy hack priority:Low labels

Their content should be moved to swh.core.

Not necessarily the right implementation. The need i see is code factorization, not necessarily a plain move ;)

Counter example: swh-model is also a leaf module (as is core). It does not depend on swh-core though.

as per discussion, we'd rather keep them self-contained than gain something out of code deduplication

assigned to @zack

added state:wontfix label

closed