[Docker] Add support for docker volumes

[ColinHebert]

Docker is able to manage volumes independently of containers. Terraform should manage those volumes (akin to EBS volumes for AWS)

https://docs.docker.com/engine/reference/api/docker_remote_api_v1.21/#2-4-volumes
https://docs.docker.com/engine/reference/commandline/volume_create/
https://github.com/fsouza/go-dockerclient/blob/master/volume.go

[jen20]

This is now supported on master - thanks for opening the issue and doing the work @ColinHebert!

[ghost]

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