cli: add support for aliases in click command groups

this allows to rename (sub)commands while keeping the old name working, albeit not listed in help messages.

Say one wants to rename: swh scheduler api-server as swh scheduler rpc-serve

but keep the former version usable.

Also fix logging config in main's swh command we want the root logger configured there, not the cli one.

Related to #1671 (closed).

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Migrated from D1479 (view on Phabricator)

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Please add click in requirements-test.txt :-)

! In !60 (closed), @olasd wrote: Please add click in requirements-test.txt :-)

Woopidoops! good catch, thx!

add click in requirement-tests

Merge request was merged

closed

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