Hygiene: NoIndexExceptions are now expected

Initially all queries went through a cache, but we don't
want to maintain a cache for the various ways contributions
can be called.  Its usefull to have this message, but it's
currently just spamming up the production Flow.log when
contributions are hit.

Patch moves logs from Flow to FlowDebug group. Basically
proposing we split logs into Flow for prod and FlowDebug
for development.

Change-Id: Idf86d203d63b11ccbf539ff1cd3caad2e54cc3d2
Merge "Hygiene: NoIndexExceptions are now expected"