Fix class methods in KVM hypervisor
Several methods in KVM hypervisor behave like 'classmethods', however, they did not have the '@classmethod' annotation. This patch adds '@classmethod' annotations to several of these methods with the goal of making '_StopInstance' available to the QA. This step is necessary for the QA test for instance shutdown detection on KVM. Signed-off-by:Jose A. Lopes <jabolopes@google.com> Reviewed-by:
Hrvoje Ribicic <riba@google.com>
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