utils: Introduce managed_ref<>
utils: Introduce managed_ref<>

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