Code review comment for lp:~clint-fewbar/drizzle/regex-policy-cache-limiter

Ugh, the opensuse and osx failures are probably due to the boost::unordered_map valgrind warnings about writing to freed memory... may require deeper investigation.

I did fix the "build repeat tests twice" problem though. I'll leave this as work in progress until I can fully understand the other issue.. hopefully by Monday.