testsuite: remove EggTestSuite
We no longer run tests with python setup.py, but simply with python -m unittest
With https://lab.nexedi.com/nexedi/slapos/merge_requests/862 we no longer need this
We no longer run tests with python setup.py, but simply with python -m unittest
With https://lab.nexedi.com/nexedi/slapos/merge_requests/862 we no longer need this