[PATCH] assorted tempfile clean-up in the test suite

A number of tests don't remove all versions of their tempfiles on VMS's
versioned filesystem. The attached patch fixes the first three culprits
I found.

• [PATCH] assorted tempfile clean-up in the test suite by Craig A. Berry
• Re: [PATCH] assorted tempfile clean-up in the test suite by Michael G Schwern
• Re: [PATCH] assorted tempfile clean-up in the test suite by H.Merijn Brand