Log some messages to help debug per-partner template issue. (#420)
Disable caching on Levels 1 and 2 pages for now.

Despite our inclusion of the vary_on_headers('Host') decorator,
caching seemed implicated in the problem where a Level 1 or 2
key page could get 'stuck' on a particular partner site for
a while. Perhaps only one Level 1 or 2 page per URL path was
being cached despite varying on the Host. (#420)