Feature/633 new name for json object rendering

### Description
New name for JSON object rendering.
The old name 'attributesFormat' is not good.
New name: 'attributeFormat'.
Old name is still supported.

And one more in 7b11559
Now 'attributeFormat' is used everywhere except in one part (just to ensure 'attributesFormat' is still working) in the new functest under 633.