Output cluster information after provisioning

[jaredhocutt]

When the provisioner completes, there is not any output to inform the user of the details of the cluster they just deployed.

The following output should be displayed for the user:

• Hostname of the web console
  • This is currently in the format of {{ cluster_name }}.{{ openshift_base_domain}}
• Hostname of the bastion host (host with SSH port open)
• Location of EC2 keypair on disk
  • This currently gets written to <openshift-provision>/playbooks/aws/keys