RFR[15] JDK-8234718: java/net/httpclient tests should cover TLSv1.3

[sha.jiang at oracle.com]

Hi,
java/net/httpclient/HandshakeFailureTest.java should cover TLSv1.3 as well.
java/net/httpclient/ShortResponseBody.java would not specify a TLS protocol.

Please note the value of the system property 
jdk.internal.httpclient.debug in HandshakeFailureTest.java is changed to 
false due to JDK-8238990 and the output overflows.

Webrev: http://cr.openjdk.java.net/~jjiang/8234718/webrev.00/
Issue: https://bugs.openjdk.java.net/browse/JDK-8234718

Best regards,
John Jiang