SETCONF can't create a hidden service if the directory doesn't exist

Hi Nick, a couple weeks ago Stem's integ tests started failing. Trouble looks to be commit 85bfad1. When the tests do...

SETCONF HiddenServiceDir="test_hidden_service_empty/"
        HiddenServiceDir="test_hidden_service1/"
          HiddenServicePort="8020 127.0.0.1:8020"
          HiddenServicePort="8021 127.0.0.1:8021"
          HiddenServiceVersion="2"
        HiddenServiceDir="test_hidden_service2/"
          HiddenServicePort="8030 127.0.0.1:8030"
          HiddenServicePort="8031 127.0.0.1:8031"
          HiddenServicePort="8032 127.0.0.1:8032"
          HiddenServiceAuthorizeClient="stealth a, b"

(newlines and whitespace added for readability)

Tor previously worked, but after the commit balks with...

Dec 21 11:59:36.000 [warn] Directory test_hidden_service2/ does not exist.
Dec 21 11:59:36.000 [warn] Controller gave us config lines that didn't validate: Failed to configure rendezvous options. See logs for details.

In my case the directory owner and tor's user are the same, so there wasn't any permission issues.

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