Allow a Bridge Authority in Test Networks
Currently Chutney generates an invalid torrc when the network contains a bridge authority.
Nov 13 23:01:36.926 [warn] You cannot set both DirAuthority and Alternate*Authority.
Nov 13 23:01:36.926 [warn] Failed to parse/validate config: Directory authority/fallback line did not parse. See logs for details.
Nov 13 23:01:36.926 [err] Reading config failed--see warnings above.