Fix some bugs when invoking and using oonid.

- `config.global_options['no-geoip']` failed because of non-existing key.
- The second argument passed to `startNetTest()` was no string.
- `__init__()` in `YAMLReporter` used the current directory instead of the report directory.
The reason I'm checking the cookie is that in my setup, there simply was not `X-XSRF-TOKEN` in the HTTP request. Instead, it was inside the cookie.