Add support for following redirects in the HTTPT Test template
Currently the HTTPT Test Template will only follow the first redirect when the class attribute followRedirects is set to True.
This limits it's usefulness and is counterintuitive. Libraries such as the python urrlib2 do not have this behavior.
When we perform a request with followRedirects set to True we should follow all redirects until we get a status code different from 3xx.
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