Summary:
When a key is "out of domain" for the prefix_extractor (no
prefix assigned) then the Bloom filter is not queried. PerfContext
was counting this as a Bloom "hit" while Statistics doesn't count this
as a prefix Bloom checked. I think it's more accurate to call it neither
hit nor miss, so changing the counting to make it PerfContext coounting
more like Statistics.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/10244

Test Plan:
tests updates and expanded (Get and MultiGet). Iterator test
coverage of the change will come in next PR

Reviewed By: bjlemaire

Differential Revision: D37371297

Pulled By: pdillinger

fbshipit-source-id: fed132fba6a92b2314ab898d449fce2d1586c157