hg: jdk/sandbox: 8235925: java/net/Socket/HttpProxy.java fails on IPv4 only hosts and other small cleanups

[chris.hegarty at oracle.com]

Changeset: cb8148bd9f23
Author:    dfuchs
Date:      2019-12-17 16:11 +0100
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/cb8148bd9f23

8235925: java/net/Socket/HttpProxy.java fails on IPv4 only hosts and other small cleanups
Summary: HttpProxy test is fixed to take into account the possibility that the host may be configured with IPv4 only
Reviewed-by: chegar

+ test/jdk/java/net/MulticastSocket/NoSetNetworkInterface.java
- test/jdk/java/net/NetworkInterface/NoSetNetworkInterface.java
! test/jdk/java/net/Socket/HttpProxy.java
! test/jdk/java/net/SocketOption/OptionsTest.java