Add the code to booby trap first & last Reduce task

Signed-off-by: Joe Buck <jbbuck@gmail.com>
Merge branch 'sidr_hop' of https://github.com/four2five/hadoop-common into sidr_hop

Conflicts:

	src/mapred/org/apache/hadoop/mapred/buffer/InMemoryManager.java
	src/mapred/org/apache/hadoop/mapred/buffer/impl/JInMemoryInputBuffer.java
	src/mapred/org/apache/hadoop/mapred/buffer/net/InMemoryBufferExchangeSink.java

Signed-off-by: Joe Buck <jbbuck@gmail.com>
Merge branch 'sidr_hop' of https://github.com/four2five/hadoop-common into sidr_hop

Conflicts:

	src/mapred/org/apache/hadoop/mapred/buffer/InMemoryManager.java
	src/mapred/org/apache/hadoop/mapred/buffer/net/InMemoryBufferExchangeSink.java
Still trying to get restart resting working

Signed-off-by: Joe Buck <jbbuck@gmail.com>
Checking in current code base

Signed-off-by: Joe Buck <jbbuck@gmail.com>