Safer VOMS validator initialization.

 - Update to latest https-utils
 - Proper VOMS validator initialization at web application startup
 - Log VOMS attributes validation errors
Safer VOMS validator initialization.

Added missing files...
Descriptor changes also for webdav endpoint.
Throw exception at startup if webapp startup fails

- Remove highlighting from logging.
Merge pull request #5 from italiangrid/fix/STOR-450

Fix/stor 450