MIT: fix failing County Performance page tests

There is a better fix for this in the split-county-experiments branch,
which should be merged shortly.
Update za-hansard to the version that uses the new PopIt instance
Fix a circular import bug when running South Africa tests in isolation

When running South Africa tests in isolation, this would fail with:

    File "/home/mark/pombola/pombola/pombola/south_africa/urls.py", line 4, in <module>
      from pombola.south_africa import views
  ImportError: cannot import name views

This was caused by a circular import caused by importing
PersonSpeakerMappingsMixin from pombola.south_africa.views instead of
pombola.core.views (where it's actually defined in any case).
Update pombola_person_to_sayit_speaker for created-from-Pombola PopIts

We're now standardizing on doing name resolution in the South Africa
scrapers from PopIt instances that are mirrored from the Pombola
database. This means that we should now derive the PopIt ID from the
primary key in the Pombola database rather than one of the Identifier
objects.
Teach SASpeakerRedirectView that Person primary keys are in PopIt IDs
Merge branch 'fix-name-resolution'