We have a number of unit tests that check for HTTP responses that

redirect to a different URL, and most of these are checking headers and

response codes manually rather than using assertRedirects. The

advantage of assertRedirects is that we'd get the status codes and URL

checks built-in, but it also offers us a compatibility advantage. In

modern versions of Django, redirection URLs changed from absolute to

relative, and assertRedirects knows how to factor this in for tests.
This change updates these unit tests to use assertRedirects instead,

giving us compatibility across Django 1.6 and 1.11 for these tests.

Unit tests pass on Django 1.6 and 1.11.