Restart docker in cloud-init process to prevent hangs
Restart docker in cloud-init process to prevent hangs

Fixes #86

holmesjr/elastic-ci-stack-for-aws,caremonkey/buildkite-aws-elastic-stack,holmesjr/elastic-ci-stack-for-aws,caremonkey/buildkite-aws-elastic-stack,buildkite/elastic-ci-stack-for-aws