Resync with JDK 8 mainline

[Mike Duigou]

The lambda repos, with the exception of langtools, have been synced with jdk8 mainline (http://hg.openjdk.java.net/jdk8/jdk8)

I've lightly tested the results with jtreg and test-ng on Linux x64. Please report any problems encountered.

One issue I ran across was that the CORE_PKGS.gmk file used to generate ct.sym is now maintained in the root repo rather than the jdk repo. It's still in the jdk repo as well, but it's not used for ct.sym generation.

Mike