Log error if there are no event handlers registered

Cgroup-v2 uses `cpu.weight` property instead of cpu shares:
https://www.kernel.org/doc/html/latest/admin-guide/cgroup-v2.html#cpu-interface-files
. And it uses a different range (i.e. `[1, 10000]`) from cpu.shares
(i.e. `[2, 262144]`) to make things more interesting.

Luckily, the libcontainer provides a helper function to perform the
conversion
[`ConvertCPUSharesToCgroupV2Value`](https://pkg.go.dev/github.com/opencontainers/runc@v1.0.2/libcontainer/cgroups#ConvertCPUSharesToCgroupV2Value).

I have confirmed that docker/libcontainer performs the conversion as
well in
https://github.com/opencontainers/runc/blob/v1.0.2/libcontainer/specconv/spec_linux.go#L536-L541
, and that CpuShares is ignored by libcontainer in
https://github.com/opencontainers/runc/blob/v1.0.2/libcontainer/cgroups/fs2/cpu.go#L24-L29
.

Support configurable dynamic port range

* Rename folders to reflect purpose
* Improve captured files test coverage
* Rename CSI plugins output file
* Add changelog entry
* fix test and make changelog message more explicit
Co-authored-by: Luiz Aoqui <luiz@hashicorp.com>

Fix a test corruption issue, where a test accidentally unsets
the `NOMAD_LICENSE` environment variable, that's relied on by some
tests.

As a habit, tests should always restore the environment variable value
on test completion. Golang 1.17 introduced
[`t.Setenv`](https://pkg.go.dev/testing#T.Setenv) to address this issue.
However, as 1.0.x and 1.1.x branches target golang 1.15 and 1.16, I
opted to use a helper function to ease backports.

* Add autocomplete to nomad job dispatch
* Add autocomplete to nomad operator debug
* Update incorrect comment
* Update test to verify autocomplete
* Add changelog
* Apply lint suggestions
* Create dynamic slices instead of specific length
* Align style across predictors

* Include region and namespace in CLI output
* Add region and prefix matching for server members
* Add namespace and region API outputs to cluster metadata folder
* Add region awareness to WaitForClient helper function
* Add helper functions for SliceStringHasPrefix and StringHasPrefixInSlice
* Refactor test client agent generation
* Add tests for region
* Add changelog

We see this error all the time
```
no handler registered for event
event.Message=, event.Annotations=, event.Timestamp=0001-01-01T00:00:00Z, event.TaskName=, event.AllocID=, event.TaskID=,
```

So we're handling an even with all default fields. I noted that this can
happen if only err is set as in

```
func (d *driverPluginClient) handleTaskEvents(reqCtx context.Context, ch chan *TaskEvent, stream proto.Driver_TaskEventsClient) {
	defer close(ch)
	for {
		ev, err := stream.Recv()
		if err != nil {
			if err != io.EOF {
				ch <- &TaskEvent{
					Err: grpcutils.HandleReqCtxGrpcErr(err, reqCtx, d.doneCtx),
				}
			}
```

In this case Err fails to be serialized by the logger, see this test

```

	ev := &drivers.TaskEvent{
		Err: fmt.Errorf("errz"),
	}
	i.logger.Warn("ben test", "event", ev)
	i.logger.Warn("ben test2", "event err str", ev.Err.Error())
	i.logger.Warn("ben test3", "event err", ev.Err)
	ev.Err = nil
	i.logger.Warn("ben test4", "nil error", ev.Err)

2021-10-06T22:37:56.736Z INFO nomad.stdout {"@level":"warn","@message":"ben test","@module":"client.driver_mgr","@timestamp":"2021-10-06T22:37:56.643900Z","driver":"mock_driver","event":{"TaskID":"","TaskName":"","AllocID":"","Timestamp":"0001-01-01T00:00:00Z","Message":"","Annotations":null,"Err":{}}}
2021-10-06T22:37:56.736Z INFO nomad.stdout {"@level":"warn","@message":"ben test2","@module":"client.driver_mgr","@timestamp":"2021-10-06T22:37:56.644226Z","driver":"mock_driver","event err str":"errz"}
2021-10-06T22:37:56.736Z INFO nomad.stdout {"@level":"warn","@message":"ben test3","@module":"client.driver_mgr","@timestamp":"2021-10-06T22:37:56.644240Z","driver":"mock_driver","event err":"errz"}
2021-10-06T22:37:56.736Z INFO nomad.stdout {"@level":"warn","@message":"ben test4","@module":"client.driver_mgr","@timestamp":"2021-10-06T22:37:56.644252Z","driver":"mock_driver","nil error":null}
```

Note in the first example err is set to an empty object and the error is
lost.

What we want is the last two examples which call out the err field
explicitly so we can see what it is in this case

deps: update hashicorp/go-hclog to v1.0.0

UI: Storybook upgrade

FailoverHeartbeatTTL is the amount of time to wait after a server leader failure
before considering reallocating client tasks. This TTL should be fairly long as
the new server leader needs to rebuild the entire heartbeat map for the
cluster. In deployments with a small number of machines, the default TTL (5m)
may be unnecessary long. Let's allow operators to configure this value in their
config files.

Hopefully this work gets merged into ember-cli-storybook. For the time
being, we get a fork instead.

Suppress stats streaming error log messages when task finishes.
Streaming errors are expected when a task finishes and they aren't
actionable to users.

Also, note that the task runner Stats hook retries collecting stats
after a delay. If the connection terminates prematurely, it will be
retried, and closing the stats stream is not very disruptive.

Ideally, executor terminates cleanly when task exits, but that's a more
substantial change that may require changing the executor/drivers interface.

Fixes #10814

docs: add 1.1.6 and 1.0.12 to changelog