Commands using cobra's ExactArgs feature previously did not have any
validation that the ExactArgs was being enforced. This patchset adds
tests to ensure that in the cases ExactArgs=n, that only n args are
accepted, and other values such as x or y throw an appropriate error.
Change-Id: I27b5774e79db51e0e9bc81d8c207be80811ba459
8f27532ce0