Macosx (Lion) does not seem to be setting a default scope_id (even though the Kame IPv6 implementation can do it).
Also, there is a problem that MulticastSocket.setNetworkInterface() must be called before it is possible to join IPv6 groups.
This CR being used to push other regression test script fixes also.
Description from http://java.net/jira/browse/MACOSX_PORT-216:
Build: b201
Keywords: test-fail-macos
Tests failed (Regression)
java/net/MulticastSocket/NoLoopbackPackets.java

Build: b204
Keywords: test-fail-macos
Tests failed (JCK-RUNTIME)
api/java_net/Datagram/Socket/index_connect
api/java_net/MulticastSocket/descriptions_send