hg: jdk/sandbox: setting HTTP client default TLS version back to 1.2 only

[adam.petcher at oracle.com]

Changeset: 89bfd8e0ff19
Author:    apetcher
Date:      2018-06-06 14:29 -0400
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/89bfd8e0ff19

setting HTTP client default TLS version back to 1.2 only

! src/java.net.http/share/classes/jdk/internal/net/http/HttpClientImpl.java
! test/jdk/java/net/httpclient/http2/TLSConnection.java