system_keyspace: don't read from bogus ks
system_keyspace: don't read from bogus ks

The current code moves ks inside the database, then reads from it.
That's wrong. Make it right.

Signed-off-by: Glauber Costa <f8b79557d19b40666ebe336545a0b6178af65685@cloudius-systems.com>
Reviewed-by: Pekka Enberg <add4fcd06328a394f0ad91feda7ee057316dc5ed@cloudius-systems.com>
linearregression/scylla,acbellini/scylla,victorbriz/scylla,gwicke/scylla,guiquanz/scylla,scylladb/scylla,kjniemi/scylla,eklitzke/scylla,stamhe/scylla,aruanruan/scylla,respu/scylla,capturePointer/scylla,rluta/scylla,kangkot/scylla,rentongzhang/scylla,linearregression/scylla,rentongzhang/scylla,rluta/scylla,aruanruan/scylla,scylladb/scylla,gwicke/scylla,aruanruan/scylla,senseb/scylla,guiquanz/scylla,justintung/scylla,avikivity/scylla,scylladb/scylla,duarten/scylla,stamhe/scylla,raphaelsc/scylla,capturePointer/scylla,stamhe/scylla,bowlofstew/scylla,wildinto/scylla,bowlofstew/scylla,glommer/scylla,rluta/scylla,senseb/scylla,phonkee/scylla,avikivity/scylla,asias/scylla,shaunstanislaus/scylla,tempbottle/scylla,avikivity/scylla,kjniemi/scylla,glommer/scylla,bowlofstew/scylla,acbellini/scylla,acbellini/scylla,respu/scylla,guiquanz/scylla,wildinto/scylla,capturePointer/scylla,justintung/scylla,raphaelsc/scylla,respu/scylla,dwdm/scylla,wildinto/scylla,eklitzke/scylla,rentongzhang/scylla,dwdm/scylla,raphaelsc/scylla,tempbottle/scylla,gwicke/scylla,justintung/scylla,duarten/scylla,eklitzke/scylla,tempbottle/scylla,glommer/scylla,asias/scylla,kangkot/scylla,shaunstanislaus/scylla,shaunstanislaus/scylla,phonkee/scylla,kjniemi/scylla,senseb/scylla,linearregression/scylla,phonkee/scylla,duarten/scylla,dwdm/scylla,asias/scylla,victorbriz/scylla,scylladb/scylla,kangkot/scylla,victorbriz/scylla