nuxeo-distribution-tools must manage all possible filenames

It was required to make nuxeo-distribution-tools follow Nuxeo versioning (NXBT-580) but filenames can be exotic: nuxeo-distribution-tools must not fail at parsing them. It must fallback on a stronger version extraction, even if less viable in terms of comparison.

Add tests to check all sort of filenames we currently have in the Nuxeo server.
Add a fallback to another parsing if org.nuxeo.connect.update.Version fails.