Fix a crash when using Subvertpy 0.11.
Review Request #2289 — Created Oct. 26, 2021 and updated
Subvertpy 0.11 introduced some new logic in `client.propget()` that normalizes a path to an absolute path. This in turn triggers an eventual assertion failure in libsvn, which checks to make sure a full repository URL wasn't passed in (somewhere). This was not a problem in Subvertpy 0.10 (which also didn't have this path normalization). The problem applies only to `propget()`, and thankfully does not apply to `proplist()`. To work around this crash, we're now calling `proplist()` and filtering results from that. This method avoids the path normalization that broke us, and provides the same results. The Subvertpy bug is tracked at: https://github.com/jelmer/subvertpy/issues/35 Testing Done: Unit tests pass on Python 2 and 3, against Subverpty 0.10 and 0.11. Reviewed at https://reviews.reviewboard.org/r/11725/