Shutdown hook management is gone in trunk; restore

Review Request #187 - Created June 16, 2010 and submitted

stack
old-hbase
trunk
hbase-2725
hbase
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.


  1. Looks good to me, nice cleanup compared to branch!
  2. 
      
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