Add reference data tests to official. (#3723)

* Add golden test util to streamline symbolic and numerical comparison to reference graphs, and apply golden tests to ResNet.

update tests

use more concise logic for path property

delint

add some comments

delint

address PR comments

make resnet tests more concise, and supress warning test in py2

change resnet name template

more shuffling of data dirs

address PR comments and add tensorflow version info

Remove subTest due to py2

switch from tf.__version__ to tf.VERSION, and include tf.GIT_VERSION

supress lint error from json load unpack

* address PR comments

* address PR comments

* delint

official/utils/testing/reference_data/resnet/batch-size-32_bottleneck_projection_version-2_width-8_channels-4/results.json

+[32, 8, 8, 4, 0.918815016746521, 0.1826801300048828, 4064.4677734375, 32, 4, 4, 8, -1.6396304368972778, 0.00014326802920550108, 98.39237213134766]
\ No newline at end of file

official/utils/testing/reference_data/resnet/batch-size-32_bottleneck_projection_version-2_width-8_channels-4/tf_version.json

+["1.8.0-dev20180325", "v1.7.0-rc1-750-g6c1737e6c8"]
\ No newline at end of file

official/utils/testing/reference_data/resnet/batch-size-32_bottleneck_version-1_width-8_channels-4/results.json

+[32, 8, 8, 4, 0.1677999496459961, 0.7767924070358276, 4089.44189453125, 32, 8, 8, 4, 1.8148397207260132, 1.3842545747756958, 5515.17529296875]
\ No newline at end of file

official/utils/testing/reference_data/resnet/batch-size-32_bottleneck_version-1_width-8_channels-4/tf_version.json

+["1.8.0-dev20180325", "v1.7.0-rc1-750-g6c1737e6c8"]
\ No newline at end of file

official/utils/testing/reference_data/resnet/batch-size-32_bottleneck_version-2_width-8_channels-4/results.json

+[32, 8, 8, 4, 0.8239736557006836, 0.3485994338989258, 4108.87548828125, 32, 8, 8, 4, 0.8239736557006836, 0.3485994338989258, 1519.11328125]
\ No newline at end of file

official/utils/testing/reference_data/resnet/batch-size-32_bottleneck_version-2_width-8_channels-4/tf_version.json

+["1.8.0-dev20180325", "v1.7.0-rc1-750-g6c1737e6c8"]
\ No newline at end of file

official/utils/testing/reference_data/resnet/batch-size-32_building_projection_version-1_width-8_channels-4/results.json

+[32, 8, 8, 4, 0.5349493026733398, 0.5126370191574097, 4070.01220703125, 32, 4, 4, 8, 0.0, 1.4142168760299683, 2306.740478515625]
\ No newline at end of file

official/utils/testing/reference_data/resnet/batch-size-32_building_projection_version-1_width-8_channels-4/tf_version.json

+["1.8.0-dev20180325", "v1.7.0-rc1-750-g6c1737e6c8"]
\ No newline at end of file