[wrt][XWALK-1725] Update test steps for Crosswalk_Packer_Tool_Arch_Undefined
Merge pull request #246 from kangxu/kangxu/wrt/packertool/archUNdefined/updateSteps

[wrt][XWALK-1725] Update test steps for Crosswalk_Packer_Tool_Arch_Undef...