Need add additional option to samba config

[vponomaryov]

Bug in Manila is valid for all images done for Generic driver: https://bugs.launchpad.net/manila/+bug/1370216

need add option "include = registry" to "global" section of samba config located in "/etc/samba/smb.conf" to be able to use shares configured via "net conf" utility.

Originaly reported by David Disseldorp for default ubuntu image for Manila.