provider/aws: Add agent_version argument to AWS_OPSWORKS_STACK

[u2mejc]

This PR adds the omitted OpsWorks Agent version, used when creating Opsworks stacks.

agent_version is supported in AWS_OPSWORKS_INSTANCE, but AWS's api limits you to "INHERIT" or a static version number. The API default is to statically set the current version. Adding the agent_version argument to aws_opsworks_stack allows specifying "LATEST" so that the client can be automatically updated to the latest version.

[stack72]

Is Latest the only accepted option?

[u2mejc]

Hi Paul!

The SDK also allows you to pass specific version numbers there too, but that feature is already exposed at the instance level. The stack being the parent of the instance, will set the instance version by default. The reason for the PR is that automatic updates are not allowed at the instance level (and it's not a default).

You can find supported versions for your stack from the cli:

$ aws opsworks describe-agent-versions --stack-id ***************************************

{
    "AgentVersions": [
        {
            "Version": "3421-20150611173115",
            "ConfigurationManager": {
                "Version": "11.10",
                "Name": "Chef"
            }
        },
        {
            "Version": "3422-20150629124612",
            "ConfigurationManager": {
                "Version": "11.10",
                "Name": "Chef"
            }
        },
        {
            "Version": "3424-20150709092700",
            "ConfigurationManager": {
                "Version": "11.10",
                "Name": "Chef"
            }
        },

~ Justin 🍻

[stack72]

Hi @u2mejc

Just left a small question about the options of agent_version

P.

[stack72]

What you've said makes sense :) this LGTM!

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