[merge][#277048] don't use iteritems on registries

[Martin Pool]

Python doesn't like changing a dictionary while you're iterating it,
and it seems, per <https://bugs.edge.launchpad.net/bzr/+bug/277048>
that this can happen on the transport registry.  I'm not sure in
precisely which case it would change the registry, but it probably
depends on dictionary iteration order, and I suspect on us discovering
that some dynamic dependencies are not there.  At any rate this patch
seems like a safe fix for it.

-- 
Martin <http://launchpad.net/~mbp/>
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