Many people have problems upgrading an active system because they find

that "make update" hangs.  This happens because there are existing
locks for some of the lists that are being updated.  Instead of an
unhelpful hang, we now explicitly lock the lists and report errors
if the locks timeout.

If any of the locks timeout, we also do not update the
last_mailman_version file so that subsequent "make update"'s will
work.

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