Allocation autocomplete, client api

Fix timeout validation for script checks

fix up endpoints

refactor for simplicity

only applies to uuids, not jobs

comment updates

small refactors

build: Apply goimports formatting to various files

It appears this was disabled a year ago when defaulting and validation
code was probably different: 91bbc5c3

Fixes an issue reported via the mailing list:
https://groups.google.com/d/msg/nomad-tool/yiPCTfOpYn4/yv7MMPUABQAJ

The following files were not formatted as the output of goimports(1)
would create, causing the goimports linter to fail:

command/agent/resources_endpoint.go
nomad/resources_endpoint.go
nomad/resources_endpoint_test.go

Fix number of primary nouns in Nomad

TLS Guide

Thanks @jvoorhis!

Vendor vault test deps

Updated AWS fingerprint test for ami-id

This is a weird one because `make bootstrap` does a `go get vault` so CI
never fails due to missing Vault dependencies. However developer
machines will have whatever version of vault they grabbed last time they
bootstrapped a new dev environment.

This can lead to surprising build issues and different devs testing
slightly different code.

So let's vendor all test deps to try to keep the Nomad repo
self-contained.

Fix documentation bug on json jobs

Added dnsoptions to the docker driver

In https://github.com/hashicorp/nomad/pull/2999, I changed ami-id
to non-unique.  This updates the test to reflect that.

Fix documentation bug: distinct_host -> distinct_hosts