hg: jdk/sandbox: JDK-8230211-branch: integrated feedback

[daniel.fuchs at oracle.com]

Changeset: 8176cc48cc78
Author:    dfuchs
Date:      2020-03-18 18:11 +0000
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/8176cc48cc78

JDK-8230211-branch: integrated feedback

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