hg: jdk/sandbox: Merge

[patrick.concannon at oracle.com]

Changeset: 8a43dce8699f
Author:    pconcannon
Date:      2020-04-03 12:02 +0100
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/8a43dce8699f

Merge

! src/java.base/share/classes/java/net/DatagramSocket.java
! src/java.base/share/classes/java/net/MulticastSocket.java
! src/java.base/share/classes/java/net/NetMulticastSocket.java