Some tests not cleaning up properly

[tlhackque]

As noted in #691:

Some tests (e.g. 17-test-spaces-in-sans-http01) assume that the last test will clean up the environment. This won't happen if skipped. The cleanup should be in teardown_file() functions instead.

I didn't have time to go through all the tests (I think there were over 150 files, but most of the changes were automated...). These cases can probably be identified and addressed incrementally.

[timkimber]

Thanks - I'll take a look and fix