optionally process AWS Organization (member) accounts

[tkishel]

Description

Accept an org parameter to size AWS Member Accounts attached to an AWS Organization.
Based upon code written by Adam Clark.
Also, corrects an error resetting IFS

Motivation and Context

• Target Company has many AWS accounts, where executing a script against individual single accounts may be impossible or an unreasonable task.
• Target Company is using the AWS Organizations functionality, and has provisioned their AWS accounts as member accounts within that organization.

How Has This Been Tested?

Original functionality tested.

AWS Organization untested (I have no access to one)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

Checklist

• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes if appropriate.
• All new and existing tests passed.

[tkishel]

FWIW: I cannot set a "Do Not Merge" (until tested) label 🤷🏻‍♂️

[tkishel]

~ shellspec spec/aws_resource-count-aws.sh

Running: /bin/sh [bash 3.2.57(1)-release]
............

Finished in 4.45 seconds (user 3.84 seconds, sys 0.70 seconds)
12 examples, 0 failures

[tkishel]

Testing: I've added spec tests, covering each function in the script (and refactored the script to use functions: for all but parsing the one optional org parameter, and the jq check) ... including all of the aws commands. For the mocking of those commands, I used the example output from the AWS CLI documentation for each command.

Documentation: I don't have the source of the PDF to update it, but the optional org parameter is documented via a comment.