Looks good to me, nice cleanup compared to branch!
Shutdown hook management is gone in trunk; restore
Review Request #187 - Created June 16, 2010 and submitted
Adds a ShutdownHook class that is package private to regionserver. Manages the running of the regionserver shutdown before running the fs shutdown hook. New class has a main so its easy to check stuff works against the different hadoops; 0.20, 0.21 and cloudera 0.20.