fix to #965

[mushkevych]

fix to #965

[mushkevych]

Tests have failed due to

Traceback (most recent call last): File "/opt/python/3.6.7/lib/python3.6/runpy.py", line 193, in _run_module_as_main "__main__", mod_spec) File "/opt/python/3.6.7/lib/python3.6/runpy.py", line 85, in _run_code exec(code, run_globals) File "/home/travis/build/Parsely/pykafka/pykafka/test/kafka_instance.py", line 570, in <module> bin_dir=args.download_dir) File "/home/travis/build/Parsely/pykafka/pykafka/test/kafka_instance.py", line 166, in __init__ ManagedInstance.__init__(self, name, use_gevent=use_gevent) File "/home/travis/virtualenv/python3.6.7/lib/python3.6/site-packages/testinstances/managed_instance.py", line 63, in __init__ self._start_process() File "/home/travis/build/Parsely/pykafka/pykafka/test/kafka_instance.py", line 278, in _start_process raise ProcessNotStartingError('Unable to start Kafka cluster.') testinstances.exceptions.ProcessNotStartingError: Unable to start Kafka cluster. 

[mushkevych]

Hi @emmett9001
I was wondering how can I help with reviewing this PR?
It seems as the testing pipeline is failing inability to start Kafka test cluster.