streaming: Add has_active_sessions to stream_coordinator
streaming: Add has_active_sessions to stream_coordinator

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