Fix error from systemsetup

I get an error from each call to `systemsetup`:

```
2014-02-11 16:56:11.875 systemsetup[43070:1403] ### authenticateUsingAuthorizationSync error:Error Domain=com.apple.systemadministration.authorization Code=-60007 "The operation couldn’t be completed. (com.apple.systemadministration.authorization error -60007.)"
````

Running them as sudo fixes this, as in the proposed patch.