Database: do not create shard-specific dirs for commitlog
Database: do not create shard-specific dirs for commitlog

New ID scheme allows for a single dir for all segments from all shards.

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