mv_machine_learing: enable inference-based tests

mv_machine_learing: enable inference-based tests

[Issue type] code improvement

This patch re-enables some of the testcases which were
disabled in [1]. Specifically, all the machine learning
testcases except Face Recognition and Image Segmentation
task groups have been enabled. For Face Recognition,
there are still some memory leaks related to NNTrainer
and further investigation is required. Image Segmentation
testcases are still under development [2].

[1] https://review.tizen.org/gerrit/#/c/platform/core/api/mediavision/+/301888/
[2] https://review.tizen.org/gerrit/#/c/platform/core/api/mediavision/+/301785/

Change-Id: If97012b42165f210b1f67aaaf4a28e169c16303f
Signed-off-by: Vibhav Aggarwal <v.aggarwal@samsung.com>