[IMPYLA-52] Support kerberos for jenkins testing
[IMPYLA-52] Support kerberos for jenkins testing

Fixes #52.

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