Tests fixed

Test failed to run without virtualenvs. This PR fixes it.
Step to run tests:
# prerequisites:
#  - python3 with setuptools
#  - pypy3 with setuptools, local zookeeper 3.4+ running
```
python3 setup.py install # required for gns-api
pypy3 setup.py install
pypy3 run-test.py
# wait for about 12 seconds... should return OK