client/graph: extract calc_neighbours
client/graph: extract calc_neighbours

yuvadm/rhizi,shlomif/rhizi,cben/rhizi,tlevine/rhizi,tlevine/rhizi,shlomif/rhizi,tlevine/rhizi,cben/rhizi,shlomif/rhizi,cben/rhizi,shlomif/rhizi,Rhizi/rhizi,tlevine/rhizi,Rhizi/rhizi,Rhizi/rhizi,ozFri/rhizi,ozFri/rhizi,cben/rhizi,yuvadm/rhizi,ozFri/rhizi,Rhizi/rhizi,ozFri/rhizi,yuvadm/rhizi,yuvadm/rhizi