samba: Update to latest stable

The previous version of Samba had many critical security updates that
would've required significant backporting effort.  Update to the latest
stable release instead.

Signed-off-by: Joe MacDonald <joe_macdonald@mentor.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Joe MacDonald <joe_macdonald@mentor.com>