Add devops team keys

We decided not to pull the list of team members from Lookup (as we're not the only people who can add to the list).

So, this PR keeps it simple. It adds the teams public keys and a vars file to list team members. This means that we can use to infra gp_role 'add_users' to add devops team keys to our servers.

The gp_roles need to be on the roles_path for this to work and the vars file needs to be included with, something like:

ansible.cfg:

roles_path=<path to gp_roles>/gp_roles

playbook.yml:

- hosts: <hosts>
  vars_files: vars/devops_team_members.yml
  user: root
  roles:
    # use gp_roles add_users role
    - add_users