Utilize metadata service to get Linode info; Wait for Volume Active on Creation

[zliang-akamai]

📝 Description

This is to implement logic that retrieve Linode info from metadata service, and if failed, fall back to original hacking way for the regions that don't have metadata services enabled.

✔️ How to Test

Automated Testing

You can do make int-test if we can merge #145 before this PR.

Manually Testing

• Create a Linode in a new site (e.g. us-mia) and a Linode in an old site (e.g. us-central).
• Logging into these 2 Linode.
• Install docker, git, make, and any other necessary tool.
• Clone the repository and checkout to this feature branch.
• Run LINODE_TOKEN=<YOUR_TOKEN> PLUGIN_VERSION=dev make test
• Or manual testing
  • make build
  • docker plugin set linode/docker-volume-linode:latest linode-token=<YOUR_TOKEN>
  • docker plugin enable linode/docker-volume-linode:latest
  • Run the commands to create volumes manually, e.g. docker volume create -d linode/docker-volume-linode:latest -o delete-on-remove=true test-volume-default-size

[lgarber-akamai]

Works well on my end, nice work!

[jriddle-linode]

LGTM. works locally