CP-310956: Remove legacy winbind configuration

[liulinC]

9a468bf updated samba to 4.2x and keep legacy configuration in smb.conf conditionally for backward compatibility.

Now samba binary is updated in all releases, this commit just drop the legacy configurations

This is back port of #6822
This will make code simple and much easy to back port future commits to LCM.
I want @psafont to review for vates (XS no longer use old samba at all)

[psafont]

I can't accept this change right now, this will break xcp-ng 8.3. We can merge this in due time, but it might take weeks or even months, depending on the load of the xcp-ng packaging team

[liulinC]

I can't accept this change right now, this will break in xcp-ng 8.3. We can merge this in due time, but it might take weeks or even months, depending on the lead of the xcp-ng packaging team

Thanks for the information.
So I will keep this PR open, and please let me know when it is time to go. 😄

[psafont]

I'll mark this as draft so maintainers don't keep wondering about the issue each time they need to do reviews

[lindig]

Just for context: this has been merged to master as bf61d51; so there is no urgency to merge it into LCM.