s3-vfs_glusterfs: refuse connection when write-behind xlator is present

s3-vfs_glusterfs: refuse connection when write-behind xlator is present

s3-vfs_glusterfs: refuse connection when write-behind xlator is present

Once the new glusterfs api is available we will programmtically disable
the translator, for now we just refuse the connection as there is
a potential for serious data damage.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=14486

Guenther

Signed-off-by: Guenther Deschner <gd@samba.org>
Pair-Programmed-With: Sachin Prabhu <sprabhu@redhat.com>
Pair-Programmed-With: Anoop C S <anoopcs@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Mon Nov  2 21:40:33 UTC 2020 on sn-devel-184