[Bugfix][Frontend][TF] Fix tutorial for TF<=1.12 compatible #4592
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There is a TF 1.xx compatible issue:
The doc https://docs.tvm.ai/frontend/tensorflow.html says tvm support tf 1.12 and below, however, the from-tf tutorials https://docs.tvm.ai/tutorials/frontend/from_tensorflow.html#tutorials failed for tf 1.12 or below because of tf.compat.v1 module.
I notice this PR for TF 2.x compatiblity #4104, it would be very nice not to break the compatiblity for lower tf 1.xx versions, because most of our platform users are tf 1.10