db/system_keyspace: Fix get_local_host_id
db/system_keyspace: Fix get_local_host_id

Before:
host_id in system.local is empty

After:
host_id in system.local is inserted correctly

This fixes a hasty problem that we always get a new host_id when
booting up a node with data.

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