[8u] TLSv1.3 RFR: 8251341: Minimal Java specification change

[Alexey Bakhtin]

Hello All,

Please review small patch required to update java specification for TLSv1.3 protocol
in the javax.net.ssl.ExtendedSSLSession class.

Webrev: http://cr.openjdk.java.net/~abakhtin/tls1.3/8245466/8251341/webrev.v0
JBS task: https://bugs.openjdk.java.net/browse/JDK-8251341
CSR: https://bugs.openjdk.java.net/browse/JDK-8248721

Regards
Alexey