Let users specify AWS region dynamically.

[xydinesh]

I have a use case I have to perform actions in multiple regions. As of now I don't have way to specify region dynamically. For example,

I want to create one vpc with cidr: 10.0.1.0/24 in us-east-1 and other with cidr: 10.0.2.0/24 in us-west-1. I don't have a way to specify region for actions at the moment.

In boto3, I can pass region as region_name when creating client.

import boto3
client = boto3.client('ec2', region_name='us-west-1')

I have created custom actions to pass region as an argument at the moment.

[xydinesh]

One work around is setting region as a datastore value and let config.yaml read it.

In, /opt/stackstorm/configs/aws.yaml

region = {{ st2kv.system.region }}

[xydinesh]

This pull request #37 , address this issue.

[xydinesh]

Pull request #44, address this issue