Compare cloud provider responses in unit tests

[miyunari]

Currently we are using the pre defined response in our cloud provider unit tests.

TODO:

• read gcp response from a file
• read azure response from a file
• read aws response from a file

https://github.com/redhatcloudx/rhelocator/blob/3b24b2e345bc8dc17331f82e723da109c46dd046/tests/update_images/test_azure.py#L30-L47

We want to read a raw http response from a file. That way test responses can be updated independently.

current architecture

proposed architecture