hg: jdk/sandbox: JDK-8230211-branch: Increased test coverage for old impl

[patrick.concannon at oracle.com]

Changeset: 6f7fc1cedbb1
Author:    pconcannon
Date:      2020-04-07 11:39 +0100
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/6f7fc1cedbb1

JDK-8230211-branch: Increased test coverage for old impl

! test/jdk/java/net/DatagramSocket/SetReceiveBufferSize.java
! test/jdk/java/net/MulticastSocket/SetTTLAndGetTTL.java
! test/jdk/java/net/MulticastSocket/SetTTLTo0.java