Allow for image additions archives (as well as plugins)

It is quite useful to be able to add additional items (such
as jenkins build information) into the image but the only
way to do this seems to be via plugins archives. Using these
for such information ends badly when building neutron (because
those *plugin* archives need to contain setup.py files) so this
proposes a new mechanism to put files that are not python plugins but
are auxilary useful data to put in the image (such as the jenkins
data mentioned above).

Change-Id: Ica8b5750bd239e023f14225190e68dab75519d36

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