system_keyspace: stop the local cache.
system_keyspace: stop the local cache.

Apparently we need to register the stop function explicitly. That was not being
visible before, because the urchin binary was failing on exit before this for
some other reason. Once that was fixed, this one became apparent.

Scylla can correctly shutdown now.

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

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