TS: Pass the path to docs/examples to the tests.

In AS7, the path to the config file, passed in a system property, is only allowed to be a relative path.

In the testsuite, we would make use of absolute paths.
The reason is that we reuse the configs from docs/examples, and they change quite often, so having them in resources would be hardly maintainable.
However, docs/examples is not guaranteed to be always in the same place: E.g. for EAP, or for RPM-based installation of EAP it might end up in /var/docs or such.

I would like to pass some property from maven to the tests, but that results in absolute path.