Expose the row_cache in the column_family
Expose the row_cache in the column_family

This expose the row_cache in the column family, it will be used by the
API to get the row_cache statistic information.

Signed-off-by: Amnon Heiman <ed5fc74c4692051ad0b19749fd7cea6ec2d74b9e@cloudius-systems.com>

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