This commit adds a makefile target for generating a report for unit test
coverage. It also adds the coverage_check tool to assert that the actual
test coverage meets the specified requirement.
This also improves various aspects of the testing utilities:
* The "test" package has been renamed to "testutil"
* The "Objs" member has been removed from the CmdTest object
* The "Cmd" member has been added to the CmdTest object. This allows
testing of multiple variants of a root airshipctl command
Finally, this commit includes additional tests for root.go. These are
required in order to meet the required coverage threshold.
Change-Id: Id48343166c0488c543a405ec3143e4a75355ba43
1c999e2095