hg: jdk9/sandbox/jdk: 8148609: socket impl supportedOptions() should return an immutable set

[chris.hegarty at oracle.com]

Changeset: 49781476b709
Author:    vtewari
Date:      2016-03-03 17:21 +0000
URL:       http://hg.openjdk.java.net/jdk9/sandbox/jdk/rev/49781476b709

8148609: socket impl supportedOptions() should return an immutable set
Reviewed-by: alanb, chegar

! src/java.base/share/classes/java/net/DatagramSocketImpl.java
! src/java.base/share/classes/java/net/SocketImpl.java
+ test/java/net/SocketOption/ImmutableOptions.java