New cinder.conf.sample format

Based on recent changes in Nova, this provides a cleaner/simpler looking config file:

- Move help message before each option, rather than after.
- Print types like "string value" instead of "(StrOpt)"
- Use fewer pound symbols

Switch to a new format that looks much more like a normal config file.

Change-Id: I69f9b7b84215a2a69bdb0c4af9d5e1cb1e105a45
Check for configured IPV6 before running tests

Some folks don't/can't have IPV6 configured on their systems,
the new IPV6 tests in test_wsgi require that you do, so
let's add a check and skip if there are no IPV6 configured interfaces.

Change-Id: I7cbdcbc3ad4cc4690634f6464d6e28d9f4dfd791
Merge "Check for configured IPV6 before running tests"