Filter Expression Need To Upgrade Lib To 3.1

[Liu-Delin]

Description

Shifu supports filter expression: https://github.com/shifuml/shifu/wiki/Filter-Expressions-Testing-for-Train-Dataset-or-Eval-Dataset.
It uses JEXL inside Shifu to parse and execute the expressions, but the lib of JEXL has upgraded to 3.1. We are using 2.1.1 now, and it does not work in some cases. We can upgrade the lib to 3.1: http://commons.apache.org/proper/commons-jexl/reference/syntax.html.