Minor cleanup of test module
Minor cleanup of test module

cloudera/impyla,bhtucker/impyla,mariusvniekerk/impyla,cloudera/impyla,bhtucker/impyla,schaffino/impyla,wesm/impyla,mariusvniekerk/impyla,laserson/impyla,mariusvniekerk/impyla,schaffino/impyla,laserson/impyla,wesm/impyla,bhtucker/impyla