Fix aurora run in end to end tests.

Testing Done:
$ bash src/test/sh/org/apache/aurora/e2e/test_end_to_end.sh

Unfortunately the v2 client end to end tests are currently broken
(filed https://issues.apache.org/jira/browse/AURORA-677), but I
verified that the test for aurora task run works in that script
as well.

Bugs closed: AURORA-676

Reviewed at https://reviews.apache.org/r/25206/