add KMP setting and default test vgg19

benchmark/paddle/image/run.mkldnn.sh

 set -e
 
+unset OMP_NUM_THREADS MKL_NUM_THREADS
+export OMP_DYNAMIC="FALSE"
+export KMP_AFFINITY="granularity=fine,compact,0,0"
+
 function train() {
   topology=$1
   bs=$2

benchmark/paddle/image/vgg.py

@@ -5,7 +5,7 @@ height = 224
 width = 224
 num_class = 1000
 batch_size = get_config_arg('batch_size', int, 64)
-layer_num = get_config_arg('layer_num', int, 16)
+layer_num = get_config_arg('layer_num', int, 19)
 
 args = {'height': height, 'width': width, 'color': True, 'num_class': num_class}
 define_py_data_sources2(