`int8` SSD model compilation with TensorRT fails with error on `Scale` layer.

[Emmanuel Benazera]

This is tested on RTX 2080ti, fp16 works, int8 fails with the error below:

[error] Parameter check failed at: ../builder/Network.cpp::addScale::433, condition: scale.type == shift.type && shift.type == power.type
error parsing layer type Scale index 58
[2020-11-06 06:13:14.619] [test] [error] mllib internal error: Error while parsing caffe model for conversion to TensorRT