contrast-sdk-python tests incorrectly pass when given bad login data

[pardeema-contrast]

Because the tests appear to be checking for a 200 response code from the server, they will pass even if data is bad in test-config.json

I think this is because the Python requests library automatically does redirects and a bad Contrast request redirects back to login.

For example, I set a bogus username, api_key, and server_key and all tests in the test suite pass, but never will actually return any meaningful data.

Issue could be resolved by setting all Python requests calls use allow_redirects=False