vfs:glusterfs_fuse: ensure fileids are constant across nodes

Instead of adding a new gluster-specific mode to the fileid module, this patches provides a fileid algorithm as part of the glusterfs_fuse vfs module. This can not be configured further, simply adding the glusterfs_fuse vfs module to the vfs objects configuration will enable the new fileid mode.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=13972

Signed-off-by: Michael Adam obnox@samba.org Signed-off-by: Guenther Deschner gd@samba.org