hg: jdk/sandbox: http-client-branch: only add h2 ALPN if TLSv1.2 or greater

[chris.hegarty at oracle.com]

Changeset: cf81ddfb20a8
Author:    chegar
Date:      2018-01-31 11:49 +0000
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/cf81ddfb20a8

http-client-branch: only add h2 ALPN if TLSv1.2 or greater

! src/jdk.incubator.httpclient/share/classes/jdk/incubator/http/HttpConnection.java
! test/jdk/java/net/httpclient/http2/TLSConnection.java