This creates a local virtualhost listening on 8443 and configured to
require a ssl client cert.
Rails config file is updated so as to go to that url for outgoing
connection to the API using entries such as
  base_uri_out: https://127.0.0.1:8443
  uri_out_private_key_file: /etc/ssl/certs/clientkey_nopass.pem
  uri_out_cert_chain_file: /etc/ssl/certs/clientcert.pem

The complete environment can then be tested setup tunnels and running
against the development rails server

curl -kni http://127.0.0.1:8000/sites/rennes/jobs \
  -H'Accept: application/json' -H'Content-Type: application/json' \
  -d '{"resources": "nodes=1,walltime=00:05:00", "command": "while(true); do sleep 5;
  echo \"awake\"; done"}'