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A common use of hooks in aegir is to start and stop an ipfs node for browser tests to run against.
Since they all use ipfsd-ctl and that is moving to async/await in ipfs/js-ipfsd-ctl#353 as part of ipfs/js-ipfs#1670, it would be nice to not have to mix async and callbacks in the hooks.
This PR adds support for async hooks while not breaking existing callback based ones.