[RFR] 8242008: SSLSession inconsistencies

[Anthony Scarpino]

Hi,

I'd like a review of the following change.  There wre inconsistencies 
with SSLSession and session caching that needed to be fixed.  They are:
- With stateless resumption, SSLSession.getSessionContext() would return 
null.
- TLS 1.3 w/ session cache, the initial session was being added to the 
cache unnecessarily.
- With stateless resumption, SSLSession getPeerHost() could return 
corrupted.

A test is included for getSessionContext

https://cr.openjdk.java.net/~ascarpino/8242008/webrev.01/

thanks

Tony