[test-infra] Ensure that just reading a manifest file doesn't require us to be in a g... (#1109)

...it repo.

This regressed with ato's recent changes. In general it isn't OK to assume that
web-platform-tests are actually running in a git repo rather than in a copy
except when doing operations that actually require a git operation. Therefore
trying to find the repo root at the top level isn't OK.

View on GitHub: https://github.com/w3c/web-platform-tests/pull/1109

Received on Tuesday, 15 July 2014 21:55:43 UTC