medialibrary: Add an IFileSysteFactory implementation for network

Register a file system factory to media library to browse network.

Thanks to Abel Tesfaye <abeltesfaye45@gmail.com> for the build fixes on GCC 5.

Co-authored-by: Hugo Beauzée-Luyssen <hugo@beauzee.fr>
                Pierre Lamot <pierre@videolabs.io>

Signed-off-by: Thomas Guillem <thomas@gllm.fr>