Provide a way to pin LogicalOperator Options

                 Key: PIG-990
             Project: Pig
          Issue Type: Bug
          Components: impl
            Reporter: Dmitriy V. Ryaboy
            Priority: Minor
             Fix For: 0.6.0

This is a proactive patch, setting up the groundwork for adding an optimizer.

Some of the LogicalOperators have options. For example, LOJoin has a variety of 
join types (regular, fr, skewed, merge), which can be set by the user or chosen 
by a hypothetical optimizer.  If a user selects a join type, pig philoophy 
guides us to always respect the user's choice and not explore alternatives.  
Therefore, we need a way to "pin" options.  

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