selenium: fix problems with firefox 47 on ubuntu

Till webdriver version 0.9.0 its not possible to get a connection to firefox in your testcases.

The solution is to update to gecko.driver version 0.10.0
https://github.com/mozilla/geckodriver/releases

simply replace your old driver and restart selenium.

If that does not help update selenium rc to version 3.x. (Thats my current version)