[ivi-tct][webapi] Update package setting of getCap

- This suite is capibility checking wgt, Do not pack it as main wgt(which index.html is linked to webrunner),
  Update it as sub wgt, it will have a correct index.html when packing
Merge pull request #1535 from haoxli/tct/webapi/update-getCap

[ivi-tct][webapi] Update package setting of getCap