* Adds kn revision delete command
* Adds unit tests for revision delete command
* Adds integration tests for revision delete command
Added revision delete command tests in new workflow namely
TestRevisionWorkflow.
* Removes extra line and renames an import alias
* Adds 10 seconds sleep between service create and revision delete
Also adds check for 'No resources found' while grabbing revision name.
* Clean up imports
* Removes the pause after service create
* Updates testing output strings in unit and e2e
* Updates post goimports on hack and test dirs
Navid Shaikh