4889. [func] Warn about the use of old root keys without the new

4889.   [func]          Warn about the use of old root keys without the new
                        root key being present.  Warn about dlv.isc.org's
                        key being present. Warn about both managed and
                        trusted root keys being present. [RT #43670]

(cherry picked from commit baef0ca9886bb67d7c6a2ae0405e504ccdc0fb9f)