Avoid giving out bridges with broken tor versions.
This patch makes BridgeDB avoid giving out bridges that are affected by the following bug: https://bugs.torproject.org/28912
This fixes https://bugs.torproject.org/29184.
This patch makes BridgeDB avoid giving out bridges that are affected by the following bug: https://bugs.torproject.org/28912
This fixes https://bugs.torproject.org/29184.