Labs engine playbook

[neoformit]

Add a playbook for deploying the labs engine to dev and prod servers:

ansible-playbook -i hosts --key-file ~/.ssh/galaxy-au labs_engine_prod.yml

ansible-playbook -i hosts --key-file ~/.ssh/galaxy-au labs_engine_dev.yml

This can't be run until a new Labs Engine VM has been created in AARNet.

Introduces the following vars to the VAULT:

vault_labs_admin_email
vault_labs_admin_password
vault_labs_django_secret_key
vault_labs_smtp_username
vault_labs_smtp_password
vault_labs_github_api_token
vault_labs_slack_api_key
vault_labs_slack_channel_id
vault_labs_slack_mention_user_id
vault_labs_sentry_dns

[jlqfab]

You'll also need to run the common and insspb.hostname roles. Probably also dj-wasabi.telegraf.

[jlqfab]

also need to define some ssh-specific variables such as extra_keys and ssh_config_*
see host_vars/galaxy-queue.usegalaxy.org.au.yml for example

[jlqfab]

this should be named consistently with other Galaxy playbooks. Ie labs-engine_playbook.yml. Same goes for the dev version of the playbook.