Add Mobilenet2SSDLite test

The new test works both with TensorRT and cuDNN. Preprocessing and
Postprocessing are missing. Add ClippedReLU (for ReLU6), groups for
Conv2d, additional bias for convolution.

Other minors:
-move the timer in the detector to measure all the
processing time for a given frame (both centernet and yolo);
-add int8 flag.

Signed-off-by: Micaela Verucchi <micaelaverucchi@gmail.com>
Davide Sapienza <sapienza.dav@gmail.com>

src/CenternetDetection.cpp

@@ -294,8 +294,6 @@ void CenternetDetection::update(cv::Mat &imageORIG) {
         netRT->infer(dim2, input_d);
         TIMER_STOP
         dim2.print();
-
-        stats.push_back(t_ns);
     }
     // checkResult(dim2.tot(), input_h, input);
     step_t = std::chrono::steady_clock::now();
@@ -456,5 +454,6 @@ void CenternetDetection::update(cv::Mat &imageORIG) {
 
     std::cout<<"TOTAL: \n";
     TIMER_STOP
+    stats.push_back(t_ns);
 }
 }}