1. bind trt input and output to fluid tensors

- Support setting attr in config
- Support setting dtype and initializer for input in config
test=develop

* polish the cast op doc

test=develop

* follow comments

test=develop

* fix api.spec

test=develop

- Support setting attr in config
- Support setting dtype and initializer for input in config
test=develop

* polish the cast op doc

test=develop

* follow comments

test=develop

* fix api.spec

test=develop

* add parallel graph dist test=develop

* update test=develop

* update style test=develop

* add parallel graph dist test=develop

* update test=develop

* update style test=develop

* Enable INT8 ReQuantize OP
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* Clean code
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* Add comments
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* Revert "Clean code"
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This reverts commit a7a49b8a.

* Modify requantize op test
test=develop

* fix requantize UT by moving public function to public test file.
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* Fix test fail due to file address change.
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* Change file address for requantize op.
test=develop

* refine recurrent_op
test=develop

* remove unnecessary code
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* refine recurrent_op
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* remove unnecessary code
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* In some case, the input may have one than one negative value.
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* fix matmul bug
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* remove the ignored from is_empty and less_than test=develop

* fix api spec test=develop

* fix the api spec test=develop

* test=develop

* add ir memory optimize test case for IfElse op, test=develop

* fix some unitttest failure by force using the python memory_optimize, test=develop

* tweak comments, test=develop

* fix unittest, test=develop

* fix unittest, test=develop

test=develop

test=develop

test=develop

* MKLDNN: Add UT for conv_transpose_mkldnn op.
test=develop

* MKLDNN: Add fuse_bias check UT for conv_transpose_mkldnn op.
test=develop

test=develop