RFR 8245306 : Update sun.security.ssl.SSLLogger to use Immutable DateTimeFormatter

[Rahul Yadav]

Hello,

Request to have my fix reviewed for issue:

JDK-8245306 :  Update sun.security.ssl.SSLLogger to use Immutable 
DateTimeFormatter

This fix updates sun.security.ssl.SSLLogger to use immutable 
DateTimeFormatter in place of ThreadLocal,
this is an effort as part of Project Loom, to replace usages of 
ThreadLocal wherever feasible, to
improve virtual thread memory efficiency.

Issue:  https://bugs.openjdk.java.net/browse/JDK-8245306
webrev: http://cr.openjdk.java.net/~ryadav/webrev_8245306/index.html

- rahul