Add support for af south 1 in s3 driver

[alier350]

Add support for AWS af-south-1 region to S3 storage driver

Description

We noticed the following error when running our Ansible automation on af-south-1 VMs on AWS:

File "/usr/local/lib/python3.8/dist-packages/libcloud/storage/drivers/s3.py", line 1134, in __init__
        raise ValueError('Invalid or unsupported region: %s' % (region))
    ValueError: Invalid or unsupported region: af-south-1

The reason for the error is missing configuration for the af-south-1 region of AWS in the S3 driver of libcloud, which we have remediated locally and now raising this PR to contribute back to the project.

Status

• done, ready for review (Used pylint for linting)

Checklist (tick everything that applies)

• Code linting (required, can be done after the PR checks)
• Documentation
• Tests
• ICLA (required for bigger changes)

[Kami]

Thank you for the contribution.

Only change needed is updating REGION_TO_HOST_MAP dictionary. Adding new classes is not needed anymore - this was old and now deprecated approach.

I will remove this new class and merge changes into trunk.

[Kami]

Merged, thanks!

[alier350]

Merged, thanks!

Great stuff, thanks!