Classification result is always the same with sgie classifier

@bcao I used this patch to visualize the input images for each gie:

I noticed the images where not correct as they were very dark and distortedin sgie. To fix it, I removed the offset configuration and added enable-padding=1.

After altering the configurations, the resulting images for sgie classifier are what I expected but the resulting classification are still wrong.
I used these images to run inference with the same model in TLT and the result is correct. But in deepstream pipeline, it is not, as it is predicted always the same label, with the values I said in the previous comment.