RFR 8206929: Check session context for TLS session resumption

[Adam Petcher]

This change adds some checks for session resumption in TLS 1.3 to ensure 
that the resumed session is compatible with what is requested. 
Specifically, I'm adding checks for protocol version, cipher suite, 
client authentication, and signature schemes. There are also some minor 
whitespace formatting changes in PreSharedKeyExtension.java.

This is a JDK 11 change, so please review soon.

Webrev: http://cr.openjdk.java.net/~apetcher/8206929/webrev.00/
JBS: https://bugs.openjdk.java.net/browse/JDK-8206929