storage_proxy: cleanup commented origin code
storage_proxy: cleanup commented origin code

Remove code that was already reimplemented. Makes file navigation much
easier.

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