RFR: 8153572: [JEP 110] IOException (connection closed for reading) is thrown when try to connect HTTPS service

[Michael McMahon]

Simple change to set default use of TLSv1.2 when the user
has not specified which protocols to use.

http://cr.openjdk.java.net/~michaelm/8153572/webrev.1/

The change is in HttpClientImpl.java but also includes some logging
additions.

Thanks
Michael