Update ElastiCache CodeGen test based on new SDK

[nmvk]

ElastiCache would use new AWS SDK Go to include new features like LogDelivery which are currently not part of elasticache-controller. This PR updates the test data used in code generator for Elasticache tests.

Additionally I have updated generator.yaml to be inline with one being used in elasticache-controller. Updated unit tests which use CacheCluster resource to ReplicationGroup.

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

[jaypipes]

@nmvk no changes to the sdk.go generation?

[a-hilaly]

@nmvk what changes does this version bring exactly? This repository is using aws/aws-sdk-go for it private/model package.
If you need this version for elasticache-controller code generation you can set it using AWS_SDK_GO_VERSION env variable

[a-hilaly]

/test all

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[a-hilaly]

/test unit-test

[nmvk]

Thanks @jaypipes @a-hilaly I got confused about the usage of the aws-sdk-go in this project. I originally thought our tests used them. I have updated the PR with ElastiCache specific change.

[a-hilaly]

Thanks! Yes i agree that it is a bit confusing :)

[a-hilaly]

👍

[a-hilaly]

/lgtm

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