Leo Hemsted 7f883f1355 don't store non-strings to os.environ ...

in tests, we were replacing os.environ with a basic dict so that
we didn't overwrite the contents of the real environment during tests.
However, os.environ doesn't accept non-str values, so this commit
changes the fixture so that it asserts all values set are strings.
We needed to change how we store ip whitelist stuff in the env because
of this.

2017-07-11 15:41:44 +01:00

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