The plan applier has to get a snapshot with a minimum index for the
plan it's working on in order to ensure consistency. Under heavy raft
loads, we can exceed the timeout. When this happens, we hit a bug
where the plan applier blocks waiting on the `indexCh` forever, and
all schedulers will block in `Plan.Submit`.

Closing the `indexCh` when the `asyncPlanWait` is done with it will
prevent the deadlock without impacting correctness of the previous
snapshot index.

This changeset includes the a PoC failing test that works by injecting
a large timeout into the state store. We need to turn this into a test
we can run normally without breaking the state store before we can
merge this PR.

Increase `snapshotMinIndex` timeout to 10s.
This timeout creates backpressure where any concurrent `Plan.Submit`
RPCs will block waiting for results. This sheds load across all
servers and gives raft some CPU to catch up, because schedulers won't
dequeue more work while waiting. Increase it to 10s based on
observations of large production clusters.

* csi_hook: valid if any driver supports csi volumes

Replace deprecated `template` block with `templatefile` function

Lob.com has been ramping up our use of Nomad for ~6 months.
Now that we've started blogging about it we'd love to be on the _official_ list.

Fix detach handling for:

- `deployment fail`
- `deployment promote`
- `deployment resume`
- `deployment unblock`
- `job promote`

CNI changed how to bring up the interface in v0.2.0.
Support was moved to a new loopback plugin.

https://github.com/containernetworking/cni/pull/121

Fixes #10014

Improve Autoscaler overview documentation.

Updates TLS documentation

* Return evalID if `-detach` flag is passed to job revert

The changelog entry for #13340 indicated it was an improvement. But on
discussion, it was determined that this was a workaround for a
regression. Update the changelog to make this clear.

In addition to jobs, there are other objects in Nomad that have a
specific format and can be provided to commands and API endpoints.

This commit creates a new menu section to hold the specification for
volumes and update the command pages to point to the new centralized
definition.

Redirecting the previous entries is not possible with `redirect.js`
because they are done server-side and URL fragments are not accessible
to detect a match. So we provide hidden anchors with a link to the new
page to guide users towards the new documentation.
Co-authored-by: Tim Gross <tgross@hashicorp.com>

These flags were not being used because GNUmakefile overwrites them with
another value. We also don't want to set `-s -w` since they remove
information that is important for production debug.

In other projects this variable is used to override the default `-dev`
prerelease that is set even if `VersionPrerelease` is empty, but in
Nomad this check is never actually done because this conditional in
`version/version.go` is always false:

```go
func GetVersion() *VersionInfo {
  // ...
  rel := VersionPrerelease
  // ...
  if GitDescribe == "" && rel == "" && VersionPrerelease != "" {
    rel = "dev"
  }
  // ...
}
```

This seems like some leftover from a previous release process, but I
decided the leave the code as is.

* website: fix redirects with fragments

Vercel redirects don't support fragments in relative destination paths,
so an absolute URL must be specified instead.

* website: fix Vercel redirect documentation link

Signed-off-by: Grant Griffiths <ggriffiths@purestorage.com>

* template: improve default language for max_stale and wait
Co-authored-by: Michael Schurter <mschurter@hashicorp.com>

build: rearrange go path order on windows

If PATH comes first, an older version of Go is used that cannot install
dependencies that use features of newer versions of Go, which we just
installed.

helpers: provide a few generic helper functions

This PR deprecates some functions in favor of generic alternatives.

The new functions are compatible only with Nomad v1.4+.

The old functions (nor their use) should not be removed until Nomad v1.6+.

If the node has been GC'd or is down, we can't send it a node
unpublish. The CSI spec requires that we don't send the controller
unpublish before the node unpublish, but in the case where a node is
gone we can't know the final fate of the node unpublish step.

The `csi_hook` on the client will unpublish if the allocation has
stopped and if the host is terminated there's no mount for the volume
anyways. So we'll now assume that the node has unpublished at its
end. If it hasn't, any controller unpublish will potentially hang or
error and need to be retried.

Add boolean 'guest_agent' config option for QEMU driver, which will
create the socket file for the QEMU Guest Agent in the task dir when
enabled.

docker: update images to reference hashicorpdev dockerhub organization
generate job_init.bindata_assetfs.go
Co-authored-by: Luiz Aoqui <luiz@hashicorp.com>

consul-template: Add fault tolerant defaults
Co-authored-by: Tim Gross <tgross@hashicorp.com>

`heartbeat_grace` is a `server` parameter, not a `client` parameter.

Bumps [node-fetch](https://github.com/node-fetch/node-fetch) from 2.6.1 to 2.6.7.
- [Release notes](https://github.com/node-fetch/node-fetch/releases)
- [Changelog](https://github.com/node-fetch/node-fetch/blob/main/docs/CHANGELOG.md)
- [Commits](https://github.com/node-fetch/node-fetch/compare/v2.6.1...v2.6.7

)

---
updated-dependencies:
- dependency-name: node-fetch
  dependency-type: indirect
...
Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Bumps [ember-page-title](https://github.com/ember-cli/ember-page-title) from 6.2.0 to 7.0.0.
- [Release notes](https://github.com/ember-cli/ember-page-title/releases)
- [Changelog](https://github.com/ember-cli/ember-page-title/blob/master/CHANGELOG.md)
- [Commits](https://github.com/ember-cli/ember-page-title/compare/v6.2.0...v7.0.0

)

---
updated-dependencies:
- dependency-name: ember-page-title
  dependency-type: direct:development
  update-type: version-update:semver-major
...
Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>