Fix puppetfile

It seems r10k does not like the slash when not downloading from the forge, so it
downloads the module into a subdirectory instead, and the clean it does after
removes it so we end up without the modules.

I'll also add a pupppetfile check to the puppet checks, but this is making the
runs fail so needs fast fix first

Change-Id: Iec489cbb79ac56a614117bf8b9e6cfefc3ac069e
Signed-off-by: David Caro <dcaroest@redhat.com>