Explicit "ORPort 0" should still trigger client mode
I have some scripts (which worked with 0.2.2.x) that explicitly specify "ORPort 0" in torrc files they generate for a Tor process that's meant to run in client mode. With 0.2.3.x, this seems to put the configuration parser into server mode, and then it bombs out because it doesn't like UseBridges=1 in server mode.
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