Make Pig work with multiple versions of Hadoop

                 Key: PIG-924
             Project: Pig
          Issue Type: Bug
            Reporter: Dmitriy V. Ryaboy

The current Pig build scripts package hadoop and other dependencies into the 
pig.jar file.
This means that if users upgrade Hadoop, they also need to upgrade Pig.

Pig has relatively few dependencies on Hadoop interfaces that changed between 
18, 19, and 20.  It is possibly to write a dynamic shim that allows Pig to use 
the correct calls for any of the above versions of Hadoop. Unfortunately, the 
building process precludes us from the ability to do this at runtime, and 
forces an unnecessary Pig rebuild even if dynamic shims are created.

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