Update Greengrass Hello World examples

[hui-yang]

Issue #, if available:

Description of changes:

1. Greengrass Hello World NodeJS
   1. Migrate to Node8
   2. Add Greengrass Core SDK v1.4.0
2. Greengrass Hello World Python
   1. Migrate to Python3.7
   2. Update Greengrass Core SDK v1.4.0
   3. Remove Greengrass Commons and Greengrass IPC SDK, because these should be provided by Greengrass Core.

Description of how you validated changes:
End-to-end test with Greengrass v1.9.3.

Checklist:

• Write/update tests
• make pr passes
• Update documentation
• Verify transformed template deploys and application functions as expected
• Add/update example to examples/2016-10-31

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

[codecov-io]

Codecov Report

Merging #1191 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1191   +/-   ##
=======================================
  Coverage   94.36%   94.36%           
=======================================
  Files          71       71           
  Lines        3621     3621           
  Branches      713      713           
=======================================
  Hits         3417     3417           
  Misses        104      104           
  Partials      100      100

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