Added a new method cloneable? to check if VMs/Templates can be cloned or not

issue #253
https://bugzilla.redhat.com/show_bug.cgi?id=1122712
You don't need this context either, because TemplateRedhat doesn't define the ```#cloneable?``` method. It just inherits from VmOrTemplate, which you've already tested up above. You don't need to ensure that ruby class inheritance works. :smile: