bundlerepo: apply phase data stored in the bundle instead of assuming `draft`
The phase information contained in the changegroup part and the explicit
`phase-heads` part are now taken in account.
Initial changes and test by Matt Harbison, code rework by Pierre-Yves David.
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https://www.mercurial-scm.org/wiki/ContributingChanges
If you just want a checklist to follow, you can go straight to
https://www.mercurial-scm.org/wiki/ContributingChanges#Submission_checklist
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273ce12ad8f1` will report some style violations on a very old commit).