Code upgrade for TensorFlow 2

[madgagarin]

No description provided.

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[madgagarin]

@googlebot I signed it!

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CLAs look good, thanks!

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[LowSkillDeveloper]

also should change

tf.gfile.

to

tf.io.gfile.

[LowSkillDeveloper]

And need replace

import tensorflow as tf

to

import tensorflow.compat.v1 as tf
tf.disable_v2_behavior()

in the label_image.py

[tiandiao123]

Thank you for noticing!!!

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