[SPARK-4339][SQL]  Make fixedPoint Configurable in Analyzer.

fixedPoint limits the max number of iterations,it should be Configurable.
But it is a contant in Analyzer.scala,like that "val fixedPoint = FixedPoint(100)".

I don't know that this was the intent of the TODO. A system property is not a parameter. This also changes the type from `FixedPoint` to an int.