new nomad job format

[wizzdom]

• adding in HA where possible (2-3 instances of a given task)
• moving DBs to a seperate task group so that tasks can be redeployed without redeploying the DB
• use *.service.consul in place of {{ env "NOMAD_ADDR_port" }} etc.
• add update blocks to redeploy gracefully
• add consul service and health checks to all services (especially DBs)
• add wait-for-db task to all services using DBs, (I know it's ugly but its the only way at the moment)