tests/scripts/serve: Disable log formatting
tests/scripts/serve: Disable log formatting

This appeared to be causing failues on Travis with colorized output.

Also fixes the tab completion test, since `test-config.json` doesn't
exist out of the box.

mbland/url-pointers,mbland/url-pointers,mbland/custom-links,mbland/custom-links,mbland/custom-links,mbland/url-pointers