Add initial CLI unit test.
Add CLI#createHub test using Hub mock.

Use new Mockery dependency to mock the Hub.
CLI requires process option for its constructor.
Add configuration unit test.
100% coverage for configuration.
Event logging to stderr, not stdout. Fix CI XML.

stdout must be clean for exporting XML in CI.
100% line coverage for ip.
100% coverage for color.
100% coverage for hijack.
100% coverage for util.
Fix lint problems with configuration unit test.
Add TestServer#serve test.
Split mega-test into smaller tests.
100% coverage for test-server.
We already know these are Yeti tests.
100% coverage for layers.
Remove configuration unit test debug logging.
Merge branch 'unit-coverage'