* update versions of all products and add consul-template
* update client and server user_data scripts
* modify README.md and terraform.tfvars
* fix typo in consul-template system unit file
* update AMI id
* upgrade Nomad from 0.8.4 to 0.8.6
* update deprecated nomad and vault commands
* update AMI ID
* add ingress rule for default fabio port and fabio UI
* upgrade Consul and Vault versions
* update AMI ID in README.md and terraform.tfvars