Add support for deleting resources from multiple regions in AWS

[shubhamsg199]

Adding support for deleting resources from multiple regions in AWS.

• The region for ec2 in settings.yaml will take the list of regions instead of a single region

Output:

$ swach -d ec2 --all
<<<<<<< Running the cleanup script in DRY RUN mode >>>>>>> 
The EC2 providers settings are initialized and validated !

Cleaning resources from the region: ap-south-1

=========== DRY SUMMARY ============

No resources are eligible for cleanup!

====================================


Cleaning resources from the region: eu-west-1

=========== DRY SUMMARY ============

No resources are eligible for cleanup!

====================================


Cleaning resources from the region: us-west-2

=========== DRY SUMMARY ============

No resources are eligible for cleanup!

====================================

Issue: #12

[apodhrad]

I suggest to keep the same convention for all cloud providers. Currently, the REGION is just a string. Now, it will be a string for Azure and GCP and an array of string for AWS.

What do you think about using REGION for a single string and REGIONS for an array? REGIONS could throw an error something like 'Not yet supported for Azure/GCP' for cloud providers other than AWS. In the future, others can add such a support for Azure and GCP.

[shubhamsg199]

Thanks for your input @apodhrad
Since deleting resources from multiple regions is the objective I think an array for REGIONS will be a good idea.
We can also add the same support for AZURE/GCP and handle the errors accordingly in the future.
OR
I can also create a new module which can have the Regions data and settings.yaml would then contain REGIONS as Strings itself.
So users would also have to update that new module file with the regions they want the resources to be deleted which will be a new task in addition to updating settings.yaml
what do you think? @apodhrad , any views on this @jyejare

[jyejare]

@shubhamsg199 Please rebase your PR with new merged PR #24 !

[jyejare]

The looping needs to take care of deleting the resources along with not showing those deleted resources from one region in another region for dry data. Same is impacting in VM deletion.

Also, I we can rename region to plural regions for all CRs and we can pass single, multiple regions or all. In case of all we will auto fetch list of regions from EC2Client.list_regions()

[jyejare]

Ping @shubhamsg199 !!!