Base path for all unit tests is install/ui/js. This path is also used
by PhantomJS when runnig unit tests from command line. PhantomJS then
tries to find qunit.js therefor symlink in install/ui/js is needed.
This might be automated in the future.
Related: https://pagure.io/freeipa/issue/7278
Reviewed-By: Christian Heimes <cheimes@redhat.com>
