Stop printing scope as part of Operator.toString()

                 Key: PIG-726
             Project: Pig
          Issue Type: Improvement
            Reporter: Thejas M Nair

When an operator is printed in pig, it prints a string with the user name and 
date at which the grunt shell was started. This information is not useful and 
makes the output very verbose.
For example, a line in explain is like -
ForEach tejas-Thu Mar 19 11:25:23 PDT 2009-4 Schema: {themap: map[ ]} Type: bag

I am proposing that it should change to -
ForEach (id:4) Schema: {themap: map[ ]} Type: bag

That string comes from scope in OperatorKey class. We don't use make use of it 
anywhere, so we should stop printing it. The change is only in 

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