chutney needs to set AlternateBridgeAuthority too
Since git commit 21c6c8485 (to Tor), Tor won't start if TestingTorNetwork is on, AlternateDirAuthority is set, but AlternateBridgeAuthority is not.
Since git commit 21c6c8485 (to Tor), Tor won't start if TestingTorNetwork is on, AlternateDirAuthority is set, but AlternateBridgeAuthority is not.