system_tables: implement load_tokens
system_tables: implement load_tokens

A simple translation from the original code

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

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