Add web service discovery support to Samba

Background:
Windows Explorer Network Browser is not showing FreeNAS in Neighbor if Windows 10 don't have SMB/1.0 enabled and we don't force SMB/1.0 Compatibility in SAMBA.
Because SMB/1.0 is buggy deprecated it's bad idea to enable it.
Problem: Nas is not visible to windows 10 computer in network browser. and for masive nontechnical users accessing via putting address \\MyNAS\ is unhandy.

Solution to this problem acorrding to https://support.microsoft.com/en-ca/help/4034314/smbv1-is-not-installed-by-default-in-windows is implementation of WS-Discovery protocol.

There is ready component (python script on MIT licence that covers that problem)
https://github.com/christgau/wsdd
i successfuylly tested it on my freenas 11.1-U7
IMHO it's hadny to have NAS just visible for windows 10 users as an icon in Explorer in Network Section.