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.

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