UBUNTU: SAUCE: (namespace) fuse: Translate ids in posix acl xattrs

Fuse currently lacks comprehensive support for posix ACLs, but
some fuse filesystems process the acl xattrs internally. For this
to continue to work the ids within the xattrs need to be mapped
into s_user_ns when written to the filesystem and mapped from
s_user_ns when read.

Signed-off-by: Seth Forshee <seth.forshee@canonical.com>
Signed-off-by: Ondrej Kubik <ondrej.kubik@canonical.com>
(cherry picked from commit 2e727f6da8da330a8cc8b20ea99d283400bb369c)
Signed-off-by: Shrirang Bagul <shrirang.bagul@canonical.com>