Remove spec describing a behavior in a situation that never arises

- It was a false negative anyway. CDRExampleGroup reports a change to its state property any time a child changes state, whether or not the that makes the group's state is actually change
Instances of CDRExample and CDRExampleGroup are only allowed to run once
CDRExample and CDRExampleGroup release their spec blocks once they have finished running

[#66016196]
Merge pull request #234 from pivotal-brian-croom/release-spec-blocks-after-execution

Release spec blocks after execution