[openssl-project] Reuse of PSKs between TLSv1.2 and TLSv1.3

[Salz, Rich]

>    "We should remove the TLSv1.2 to TLSv1.3 PSK compatibility mechanism as
    discussed in issue 6490. If TLSv1.2 PSKs are configured (and not TLSv1.3
    PSKs) then we should disable TLSv1.3."
  

This seems reasonable to me, albeit a bit wordy since you could delete the first sentence. :)