Implement support for external cloud resources

[tonybaloney]

Dimension Data does not offer the whole suite of cloud services, things like object storage, messaging, monitoring APIs. I am being told our clients want to leverage multicloud. In order to support this, I would like to propose integration with Hashicorp Terraform.

Extending the blueprint

A new attribute for the blueprint called multicloud (or terraform?) that supports:

• a local .tfstate file containing the terraform templates (e.g. https://github.com/hashicorp/terraform/tree/master/examples/aws-two-tier) OR
• an inline terraform state definition in YAML (nice to have)

The blueprint multicloud will allow passing variable to the terraform template

Extending the container.

When a fitting has 'multicloud', we call out to terraform to provision the external resources via a CLI (wrap from Python). Because Terraform is 150MB, I recommend having a separate container image for multi-cloud.

[tonybaloney]

done in 0.9.6. Need to address the Docker issue where it only fetches the fittings.yaml file

[tonybaloney]

added support for fetching manifests. closing issue