commit fa70b87c upstream.

GUIDs although random, and 16 bytes, need to be generated as
proper uuids.

[js] no create_durable_v2_buf in 3.12 yet
Signed-off-by: Steve French <steve.french@primarydata.com>
Reviewed-by: Aurelien Aptel <aaptel@suse.com>
Reported-by: David Goebels <davidgoe@microsoft.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>