add timer in run_app_tests

[edieYoung]

add timers for each app in the run_app_tests.sh

[edieYoung]

running output in jerkins: http://172.168.2.101:8080/view/ZOO-PR/job/ZOO-PR-Python-AppTests/57/console
apps running time:
#1 anomaly-detection-nyc-taxi time used:198 seconds
#2 object-detection time used:634 seconds
#3 ncf-explicit-feedback time used:194 seconds
#4 wide_n_deep time used:329 seconds
#5 using_variational_autoencoder_and_deep_feature_loss_to_generate_faces time used:755 seconds
#6 using_variational_autoencoder_to_generate_faces time used:461 seconds
#7 using_variational_autoencoder_to_generate_digital_numbers time used:256 seconds
#8 sentimentAnalysis time used:1495 seconds
#9 image-augmentation time used:133 seconds

[glorysdj]

LGTM