Stub out instance action events in test_compute_mgr
Stub out instance action events in test_compute_mgr

We have a nice little stub utility to mock these out so rather than copy
the same mock code in each test case that needs to handle these
decorators, just set the stubs globally using the utility method in
setup of the test case and be done with it.

Change-Id: I85a1b1485eb7e7b39308cc7d0d4b882481bf0da2

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