* Removed deprecated Spark pieces.
* Bumped HashiCorp stack versions to current as of commit date
* Bumped versions of HashiCorp stack tools
* Bumped versions, added VAULT_ADDR in GCP, removed refs to Spark in shared README
* 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
Got a warning message:
```
WARNING! The "vault init" command is deprecated. Please use "vault operator
init" instead. This command will be removed in Vault 0.11 (or later).
```
Got:
```
WARNING! The "nomad server-members" command is deprecated. Please use "nomad
server members" instead. This command will be removed in Nomad 0.10 (or
later).
```
