[Samba] Guest logins from Apple OS X broken in 4.4.2, fixed in 4.4.3.

[Jeremy Allison]

Just to make a note for Samba users
as this didn't make the release notes,
4.4.2 broke guest logins for OS X, and
4.4.3 fixes them.

We'll probably make a note in the
4.4.4 release notes.

Hope this helps some people,

Jeremy.