pytorctl should learn to try both CookieAuth and PasswordAuth

pytorctl apparently suffers from the same problem Vidalia did in #3898 (closed), except backwards -- where Vidalia would try cookie if offered and give up if it fails, apparently pytorctl tries password if offered and gives up if it fails.

https://gitweb.torproject.org/pytorctl.git/blob/HEAD:/TorCtl.py#l532

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