Remove the cinder.conf.sample file

We removed the conf_uptodate checks however we didn't
remove the cinder.conf.sample file, but we should.

Now that we're not checking it, it's guaranteed that it will
most certainly be "wrong".  So, this patch removes it, we'll
update the README.conf.sample file if/when we have an auto
published version available.

Change-Id: I0a04f82a843ce795ec7518b58a3677ce3f2a314d
Merge "Remove the cinder.conf.sample file"