exchange: check actually missing revs for obsolete / unstable revs (issue6372)
The previous code was using `outgoing.ancestorsof`, which was originally called
`outgoing.missingheads` although not containing the missing heads. This
confusion was probably the reason why the buggy code was written.
The actually outgoing changesets are stored in `outgoing.missing`. By checking
all outgoing changesets, we avoid the problem and can show the list of all
obsolete or unstable changesets, which is more helpful for the user.
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