Add CONSUL_HTTP_SSL to systemd unit file

[spuder]

If you are using consul with TLS enabled, the following must be added to the systemd unit file

Environment="CONSUL_HTTP_SSL=true"
Environment="CONSUL_CACERT=/path/to/cacert.pem"
Environment="CONSUL_CLIENT_CERT=/path/to/clientcert.pem"
Environment="CONSUL_CLIENT_KEY=/path/to/clientkey.pem"

hashicorp/nomad#6594

[spuder]

Just noticed that the unit file has this line:

EnvironmentFile=-/etc/sysconfig/nomad

Thus making it possible to inject environment variables by managing that file in a pupppet role/profile.