hg: jdk/sandbox: JDK-8230211-branch: Updated tests to Increase test coverage

[patrick.concannon at oracle.com]

Changeset: 3686dc24f730
Author:    pconcannon
Date:      2020-04-03 15:12 +0100
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/3686dc24f730

JDK-8230211-branch: Updated tests to Increase test coverage

! src/java.base/share/classes/java/net/MulticastSocket.java
! test/jdk/java/net/DatagramSocket/SetReceiveBufferSize.java
! test/jdk/java/net/DatagramSocket/TestAfterClose.java