There seems to be some unreliability issue with this test on
appveyor.
Addresses ticket 31757; This isn't a final fix for this issue, but
it should make CI pass.
This script takes a set of example torrcs and command-lines from
src/test/conf_examples. If a success is expected, it runs "tor
--dump-config" and compares the result with the one we expect. If a
failure is expected, it runs "tor --verify-config" and greps for the
error we expect.