CLOUDSTACK-5299: set hypervisor_type of volumes from image format if not set.
[UI] kvm vm snapshot not shown if kvm.snapshot.enabled is set to false
CLOUDSTACK-5293: get vm disk statistics only from DISK (not for ISO/FLOPPY)
allow delete snapshot with ERROR state
CLOUDSTACK-5302. listHosts API response - value of cpuallocated is always 0%