api/column family: bloom filter statistics
api/column family: bloom filter statistics

This patch uses the now existing infrastructure to expose statistics about the bloom
filters hit/miss rates.

Signed-off-by: Glauber Costa <f8b79557d19b40666ebe336545a0b6178af65685@cloudius-systems.com>

duarten/scylla,asias/scylla,eklitzke/scylla,victorbriz/scylla,senseb/scylla,scylladb/scylla,scylladb/scylla,shaunstanislaus/scylla,aruanruan/scylla,respu/scylla,capturePointer/scylla,bowlofstew/scylla,gwicke/scylla,gwicke/scylla,victorbriz/scylla,justintung/scylla,tempbottle/scylla,stamhe/scylla,linearregression/scylla,kangkot/scylla,kangkot/scylla,kjniemi/scylla,scylladb/scylla,kjniemi/scylla,glommer/scylla,acbellini/scylla,dwdm/scylla,avikivity/scylla,glommer/scylla,guiquanz/scylla,rentongzhang/scylla,shaunstanislaus/scylla,bowlofstew/scylla,senseb/scylla,senseb/scylla,acbellini/scylla,raphaelsc/scylla,justintung/scylla,dwdm/scylla,phonkee/scylla,respu/scylla,duarten/scylla,phonkee/scylla,duarten/scylla,stamhe/scylla,shaunstanislaus/scylla,raphaelsc/scylla,linearregression/scylla,glommer/scylla,eklitzke/scylla,rentongzhang/scylla,aruanruan/scylla,guiquanz/scylla,avikivity/scylla,kjniemi/scylla,phonkee/scylla,wildinto/scylla,kangkot/scylla,stamhe/scylla,dwdm/scylla,rluta/scylla,acbellini/scylla,capturePointer/scylla,bowlofstew/scylla,guiquanz/scylla,rentongzhang/scylla,gwicke/scylla,victorbriz/scylla,tempbottle/scylla,raphaelsc/scylla,asias/scylla,linearregression/scylla,respu/scylla,wildinto/scylla,capturePointer/scylla,tempbottle/scylla,avikivity/scylla,wildinto/scylla,eklitzke/scylla,justintung/scylla,aruanruan/scylla,rluta/scylla,rluta/scylla,asias/scylla,scylladb/scylla