server/rz_kernel: reduce heartbeat to 0.5 seconds
server/rz_kernel: reduce heartbeat to 0.5 seconds

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