Fix test-only issue with git 2.20 or later handling a clobbered tag #837
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When we added the xenial image on Travis CI, it came with a git upgrade. Xenial usually has git 2.7.4 but the one on travis has 2.20.1. In version 2.20 there were changes around how tags can be clobbered (or not):
git/git@0bc8d71
The test suite was relying on the old behavior, so we had to adjust the test.