Adds lifecycle fix for importing repositories.

Corrects a major flaw in the managed repositories logic.

Adds the new managed_repository module

Contains two modules, both validated against our AWS architecture:

• aws_docker_cluster: create a docker cluster, with optional settings to automatically peer to an existing VPC and to create a new keypair. Provides useful outputs including security group IDs and the instance profile roles of workers and managers for easy policy attachment
• aws_secret_store: sets up an S3 bucket, KMS keys, and policy for secret access corresponding to our in-development AWS secret management package

Alpha release of version 1, containing modules required for brood cluster.