Fixes #3036

Fix panic occuring from improper bitmap size

Deployment desc  when no stable job and autorevert

Emit task events explaining alloc health

Refactor blocking/migrating allocations

Match example update configuration to comment

"two-at-a-time" == `max_parallel = 2`

Since alloc runner just logs these errors and continues there's no
reason not to return it.

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

This PR adds a specialized description when the job has autorevert set
and there is no job to revert to.

This PR fixes an allignment calculation when determining the bitmap
size.

Fixes https://github.com/hashicorp/nomad/issues/3008