storage_service: Sleep less if we get schema version
storage_service: Sleep less if we get schema version

This drops the second node boot up time from ~12 to ~7 seconds.

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