breaking: require framework_version, py_version for chainer

[metrizable]

Issue #, if available: #1465

Description of changes:

changes include:

• framework_version, py_version required for framework Chainer
• framework_version, py_version required for framework ChainerModel
• re-order of args: convention to follow entry_point, push args with defaults below
• testing updates
• doc updates

Testing done:

unit:

% tox --parallel 3 tests/unit
✔ OK black-format in 8.452 seconds
✔ OK flake8 in 25.622 seconds
✔ OK twine in 17.197 seconds
✔ OK pylint in 40.253 seconds
✔ OK doc8 in 25.072 seconds
✔ OK py36 in 41.303 seconds
✔ OK py37 in 40.708 seconds
✔ OK sphinx in 1 minute, 49.507 seconds
✔ OK py27 in 2 minutes, 10.004 seconds

Merge Checklist

Put an x in the boxes that apply. You can also fill these out after creating the PR. If you're unsure about any of them, don't hesitate to ask. We're here to help! This is simply a reminder of what we are going to look for before merging your pull request.

General

• I have read the CONTRIBUTING doc
• I used the commit message format described in CONTRIBUTING
• I have passed the region in to any/all clients that I've initialized as part of this change.
• I have updated any necessary documentation, including READMEs and API docs (if appropriate)

Tests

• I have added tests that prove my fix is effective or that my feature works (if appropriate)
• I have checked that my tests are not configured for a specific region or account (if appropriate)
• I have used unique_name_from_base to create resource names in integ tests (if appropriate)

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

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• CodeBuild project: sagemaker-python-sdk-local-mode-tests
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