Cloned from https://bugzilla.redhat.com/show_bug.cgi?id=1723733

Description of problem:
When trying to add a Compute Resource of type EC2 (when Loading Regions), I get the following error in WebUI: "An error occurred while testing the connection: Internal Server Error". The resource is then not added.

Also, I get the traceback (attached) in logs.
The traceback suggests that there are wrong credentials but I triple-checked them and the same credentials work for me on Sat 6.5.

Version-Release number of selected component (if applicable):
Reproduced on 3 different hosts with Sat 6.6 snap 7. Couldn not reproduce on Sat 6.5.

How reproducible:
Deterministic

Steps to Reproduce:
1. Infrastructure -> Compute Resources -> Create
2. Select type AWS
3. Enter your Access Key and Secret Key
4. Click "Load Regions"

Actual results:
Error, traceback

Expected results:
Regions loaded