function top_probability missing 'self' argument; fixing python3 syntax error.

[JustinhoCHN]

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Issue #, if available:

Description of changes:

1. function top_probability missing 'self' argument;

2. function postprocessing for loop syntax error: for idx, resp in data[:self._num_requests]: should be for idx, resp in enumerate(data[:self._num_requests]):, other wise it'll raise some error like TypeError: 'int' object is not iterable in python 3.

Testing done:

I think local build test is passed.

agent_1  | -- Docs: http://doc.pytest.org/en/latest/warnings.html
agent_1  | =================== 51 passed, 2 warnings in 228.75 seconds ====================
agent_1  | 
agent_1  | [Container] 2019/05/21 01:46:48 Running command cd model-archiver/ && python -m pytest model_archiver/tests/unit_tests && cd ../
agent_1  | ============================= test session starts ==============================
agent_1  | platform linux -- Python 3.6.5, pytest-3.6.2, py-1.5.3, pluggy-0.6.0
agent_1  | rootdir: /codebuild/output/srcDownload/src/model-archiver, inifile:
agent_1  | plugins: mock-1.10.4
agent_1  | collected 28 items
agent_1  | 
agent_1  | model_archiver/tests/unit_tests/test_model_packaging.py ...              [ 10%]
agent_1  | model_archiver/tests/unit_tests/test_model_packaging_utils.py .......... [ 46%]
agent_1  | ..............                                                           [ 96%]
agent_1  | model_archiver/tests/unit_tests/test_version.py .                        [100%]
agent_1  | 
agent_1  | ========================== 28 passed in 0.13 seconds ===========================
agent_1  | 
agent_1  | [Container] 2019/05/21 01:46:48 Running command pylint -rn --rcfile=./mms/tests/pylintrc mms/.
agent_1  | Using config file /codebuild/output/srcDownload/src/mms/tests/pylintrc
agent_1  | 
agent_1  | ------------------------------------
agent_1  | Your code has been rated at 10.00/10
agent_1  | 
agent_1  | 
agent_1  | [Container] 2019/05/21 01:46:53 Running command cd model-archiver/ && pylint -rn --rcfile=./model_archiver/tests/pylintrc model_archiver/. && cd ../
agent_1  | Using config file /codebuild/output/srcDownload/src/model-archiver/model_archiver/tests/pylintrc
agent_1  | 
agent_1  | ------------------------------------
agent_1  | Your code has been rated at 10.00/10
agent_1  | 
agent_1  | 
agent_1  | [Container] 2019/05/21 01:46:57 Running command $NIGHTLYBUILD
agent_1  | 
agent_1  | [Container] 2019/05/21 01:46:57 Running command eval $NIGHTLYUPLOAD
agent_1  | 
agent_1  | [Container] 2019/05/21 01:46:57 Phase complete: BUILD State: SUCCEEDED
agent_1  | [Container] 2019/05/21 01:46:57 Phase context status code:  Message: 
agent_1  | [Container] 2019/05/21 01:46:57 Entering phase POST_BUILD
agent_1  | [Container] 2019/05/21 01:46:57 Phase complete: POST_BUILD State: SUCCEEDED
agent_1  | [Container] 2019/05/21 01:46:57 Phase context status code:  Message: 
agent_1  | [Container] 2019/05/21 01:46:57 Expanding base directory path: .
agent_1  | [Container] 2019/05/21 01:46:57 Assembling file list
agent_1  | [Container] 2019/05/21 01:46:57 Expanding .
agent_1  | [Container] 2019/05/21 01:46:57 Expanding artifact file paths for base directory .
agent_1  | [Container] 2019/05/21 01:46:57 Assembling file list
agent_1  | [Container] 2019/05/21 01:46:57 Expanding dist/*.whl
agent_1  | [Container] 2019/05/21 01:46:57 Expanding model_archiver/dist/*.whl
agent_1  | [Container] 2019/05/21 01:46:57 Expanding frontend/server/build/reports/**/*
agent_1  | [Container] 2019/05/21 01:46:57 Expanding frontend/modelarchive/build/reports/**/*
agent_1  | [Container] 2019/05/21 01:46:57 Expanding frontend/cts/build/reports/**/*
agent_1  | [Container] 2019/05/21 01:46:57 Found 253 file(s)
agent_1  | [Container] 2019/05/21 01:46:57 Preparing to copy secondary artifacts
agent_1  | [Container] 2019/05/21 01:46:57 No secondary artifacts defined in buildspec
agent_1  | [Container] 2019/05/21 01:46:57 Phase complete: UPLOAD_ARTIFACTS State: SUCCEEDED
agent_1  | [Container] 2019/05/21 01:46:57 Phase context status code:  Message:

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