Fix Yolo {x,y}_scales parser

Fix Yolo {x,y}_scales parser

[Issue type] bug fix

Previous yolo json use nested {x,y}_scales member in multiple names.
But this changed to multiple output layer with each names.

As-is
"name" : ["378", "398", ...],
"x_scales" :
[
    [1.25000, 2.00000, 4.12500],
    [1.87500, 3.87500, 3.68750],
    [3.62500, 4.87500, 11.65625]
],

To-be
[{ "name": "378",
...
"x_scales": [ 1.25000, 2.00000, 4.12500 ],},
{ "name": "398",
...
"x_scales": [1.87500, 3.87500, 3.68750],},
...
]

Change-Id: I3e8f4abd96edf101d7faabcf3b409b2b69b7019e
Signed-off-by: Kwanghoon Son <k.son@samsung.com>