CORS-4055: migrate default region check to AWS SDK v2

[tthvo]

The PR is an incremental step to migrate AWS API calls to AWS SDK v2. This only focuses on logics to get the default region from loaded config for the survey.

Note: This code path is applicable for the survey that asks the users for the install region.

[openshift-ci-robot]

@tthvo: This pull request references CORS-4055 which is a valid jira issue.

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In response to this:

The PR is an incremental step to migrate AWS API calls to AWS SDK v2. This only focuses on logics to get the default region from loaded config for the survey.

Note: This code path is applicable for the survey that asks the users for the install region.

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[openshift-ci]

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[tthvo]

/cc @yunjiang29
/label platform/aws

[tthvo]

I did a quick local test and it worked as expected 👇

Minimal run - Default region should be from the AWS profile

 ./openshift-install create install-config --dir=.
? SSH Public Key <path>
? Platform aws
INFO Credentials loaded from the AWS config using "SharedConfigCredentials: <path>" provider 
? Region  [Use arrows to move, type to filter, ? for more help]
  me-south-1 (Middle East (Bahrain))
  mx-central-1 (Mexico (Central))
  sa-east-1 (South America (São Paulo))
> us-east-1 (US East (N. Virginia))
  us-east-2 (US East (Ohio))
  us-west-1 (US West (N. California))
  us-west-2 (US West (Oregon))

Explicit region - Default region should be the specified region

$ AWS_REGION=us-west-1 ./openshift-install create install-config --dir=.
? SSH Public Key <path>
? Platform aws
INFO Credentials loaded from the AWS config using "SharedConfigCredentials: <path>" provider 
? Region  [Use arrows to move, type to filter, ? for more help]
  me-south-1 (Middle East (Bahrain))
  mx-central-1 (Mexico (Central))
  sa-east-1 (South America (São Paulo))
  us-east-1 (US East (N. Virginia))
  us-east-2 (US East (Ohio))
> us-west-1 (US West (N. California))
  us-west-2 (US West (Oregon))

Explicit invalid region - Default region should fall back to us-east-1

AWS_REGION=us-west-13 ./openshift-install create install-config --dir=.
? SSH Public Key <path>
? Platform aws
INFO Credentials loaded from the AWS config using "SharedConfigCredentials: <path>" provider 
WARNING Unrecognized AWS region "us-west-13", defaulting to us-east-1 
? Region  [Use arrows to move, type to filter, ? for more help]
  me-south-1 (Middle East (Bahrain))
  mx-central-1 (Mexico (Central))
  sa-east-1 (South America (São Paulo))
> us-east-1 (US East (N. Virginia))
  us-east-2 (US East (Ohio))
  us-west-1 (US West (N. California))
  us-west-2 (US West (Oregon))

[tthvo]

/retest

[openshift-ci]

@tthvo: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/e2e-aws-ovn-heterogeneous	0ef07df	link	false	/test e2e-aws-ovn-heterogeneous

Full PR test history. Your PR dashboard.

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[yunjiang29]

@liweinan can you do a pre-merge test against this PR?