tests: Fix some CLI tests. Add auto-stripping of newlines in the CLI output for tests that use the simple YAML string value for the expected output. Also, fix `showconfig` test to expect a root URL with a trailing slash.

--exclude=build
--exclude=dist
--exclude=docs/_cache
--exclude=docs/_counter
--exclude=bower_components
--exclude=node_modules
--exclude=docs/raw
--exclude=*.egg-info
--exclude=__pycache__
--exclude=__tmpfs__