Treat 'ExitRelay 0' as a reject-all policy
Oops! Most folks use 'ExitPolicy reject :' to flag their relay as being a non-exit, but turns out that tor has another option that does the same thing...
https://www.torproject.org/docs/tor-manual.html.en#ExitRelay
We should change the Controller's get_exit_policy() method to provide a reject-all policy when this is set. Caught thanks to Gary on tor-relays...
https://lists.torproject.org/pipermail/tor-relays/2018-March/014741.html
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