build and upload k8s resource files from helm as the base

[bwagner5]

Issue #, if available:
#93

Description of changes:

• Script the generation of plain kubernetes resources yaml files to upload as assets to the github release. This change supports users who would rather not use helm to install aws-node-termination-handler.

• I also set the default in helm for psp generation to true. afaik, generating the psp won't harm anything even if rbac is not enabled in the cluster, but correct me if I'm wrong.

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

@@           Coverage Diff           @@
##           master      #96   +/-   ##
=======================================
  Coverage   92.97%   92.97%           
=======================================
  Files           8        8           
  Lines         584      584           
=======================================
  Hits          543      543           
  Misses         29       29           
  Partials       12       12

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[jaypipes]

Only major request from me is to remove the change to the PSP default value (see inline for explanation). Otherwise, this is awesomeness.

[jaypipes]

I still think it would be a little more cogent to name the tarball individual-resources.tar and the aggregated YAML file all.yaml or all-resources.yaml. Thoughts?

[bwagner5]

ah yes, I see what you mean. I overlooked the additional stutter in your first comment. I'll update

[jaypipes]

muy bueno :)