StopTheLine - fixing the jenkins flaky header translation tests

1. Flaky tests in jenkins due to rapid create/teardown of the deproxy endpoint, and the deproxy endpoint port is not being freed up quickly enough before the next test starts

2. Refactored the header translation tests so that different test cases can be executed using one header translation config file.  This also has the added benefit of reducing the test time for this test class from 5min 47sec to 14 sec.  Boom.