py3: source-transform only call-sites of iteritems(), not definitions
branchmap.branchcache, among other classes, defines a
iteritems(). That currently gets replaced by items() by the source
transformer. That makes it harder for extensions to work with both py2
and py3, since they have to call either items() or iteritems() on
branchcache. Let's not replace definitions of iteritems() (and
itervalues()) and only replace the call-sites. We need to also add an
items() alias to branchcache (etc) so our transformer call-sites will
find it.
Differential Revision: https://phab.mercurial-scm.org/D6641
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