Just FYI,This may be my fault, but on each box I have updated, I get the following error:
(13/13) checking for file conflicts [#######################################] 100%
error: failed to commit transaction (conflicting files)python2-zope-interface: /usr/lib/python2.7/site-packages/zope.interface-3.6.3-py2.7.egg-info/ exists in filesystem
Errors occurred, no packages were upgraded. I just -f'ed it... -- David C. Rankin, J.D.,P.E.