fix number of VMs to boot calculation where shortfall resouce (cores, disk, ram) is less than the flavor resource. fix divide by zero)
fix number of VMs to boot calculation where shortfall resouce (cores, disk, ram) is less than the flavor resource. fix divide by zero)

hep-gc/cloudscheduler,hep-gc/cloudscheduler,hep-gc/cloudscheduler,hep-gc/cloudscheduler