[Bro-Dev] newly found segfaults from metrics framework

[Jonathan Siwek]

> Arg!  I'm creating indexes too large again! (not the first time I've done this).  Robin, Vern, any guidance?  I generally really like how the metrics framework is implemented now and I'd like to build on top of the current model but I obviously don't want to cause overly extensive performance problems.

>From my reading of the CompHash code, there's a general problem with it assuming it can use a fixed hash key size in situations where it can't and you just innocently found one of those situations.  Performance consideration of the metrics indexing scheme is a second thing (depends somewhat on how the first thing is fixed).

- Jon