* Fix exit code 0 upon service delete
* Mentioned bug fix in CHANGELOG.adoc
* Add error check test for service not found
* Fix for kn revision delete failure exit code and add test cases
* Testing changes in test cases for failure in intergration tests
* Fix test case error causing integration test failure
* fix(e2e): Refactor e2e utils and resource actions
brings commonly re-used utilities into lib/test so they can be resused
and e2e can be run selectively for eventing/serving.
* Refactor service and revision e2e test utils into test lib
* Docstrings for exported e2e test utils
Kaustubh Pande