Patches adding support for mDNS conflict resolution

[Gianluca Altomani]

Hi!

A couple of weeks ago I submitted a patch to add support for mDNS conflict
resolution when using the Avahi backend. The current implementation has a
memory leak and is unable to change service name when a conflict is
detected in the network. Additionally, this patch is required for Samba to
pass the Bonjour Conformance Test by Apple.

Patch: https://gitlab.com/samba-team/samba/-/merge_requests/4419

This is my first contribution and I am open to feedback.

Thanks,
Gianluca