Revert "Summary: Use hypervisor as clock source for system vms"

removing due to CLOUDSTACK-2872, ubuntu 12.04's libvirt isn't new enough

This reverts commit c7ebcb4e8c.

plugins/hypervisors/kvm/src/com/cloud/hypervisor/kvm/resource/LibvirtComputingResource.java

@@ -3366,8 +3366,6 @@ ServerResource {
         if (vmTO.getOs().startsWith("Windows")) {
             clock.setClockOffset(ClockDef.ClockOffset.LOCALTIME);
             clock.setTimer("rtc", "catchup", null);
-        } else if (vmTO.getType() != VirtualMachine.Type.User) {
-            clock.setTimer("kvmclock", "catchup", null);
         }
 
         vm.addComp(clock);