docs: add #5381 to changelog

server: inconsistent receiver notation corrected

Reverts hashicorp/nomad#5433

Apparently, channel communications can constitute Happens-Before even for proximate variables, so this syncing isn't necessary.

> _The closing of a channel happens before a receive that returns a zero value because the channel is closed._
https://golang.org/ref/mem#tmp_7

Scripts for automating binary building

To correspond to the Linux scripts in 855761a5

executor: block shutdown on process exiting

vagrant: upgrade to Go 1.11.6

executor: synchronize exitState accesses

exitState is set in `wait()` goroutine but accessed in a different
`Wait()` goroutine, so accesses must be synchronized by a lock.

Also tease out some dev and docker bits from Vagrant scripts to ease
sharing with Docker script

Freebsd vagrant fixes

Signed-off-by: HashedDan <georgedanielmangum@gmail.com>

* update versions of all products and add consul-template

* update client and server user_data scripts

* modify README.md and terraform.tfvars

* fix typo in consul-template system unit file

* update AMI id

fix possible panic in libcontainer shim init

* skeleton

* configure portworx

* destroy and redeploy mysql with data intact

* rename all directories and references from persistent storage to stateful workloads

* add considerations and remove references to StorageOS

* update wording and headings

* create portworx volume externally and modify jobfile to reflect that

* fix typo

* Update website/source/guides/stateful-workloads/portworx.html.md
Co-Authored-By: Omar-Khawaja <Omar-Khawaja@users.noreply.github.com>

* Update website/source/guides/stateful-workloads/portworx.html.md
Co-Authored-By: Omar-Khawaja <Omar-Khawaja@users.noreply.github.com>

Freebsd 11.1 went EOL 9/30/18:
https://lists.freebsd.org/pipermail/freebsd-announce/2018-September/001842.html

Was seeing a failure with shared object "libdl.so.1" not found which
is required for bash

Fix #5418

When using a docker logger that doesn't support log streaming through
API, currently docker logger runs a tight loop of Docker API calls
unexpectedly. This change ensures we stop fetching logs early.

Also, this adds some basic backoff strategy when Docker API logging
fails unexpectedly, to avoid accidentally DoSing the docker daemon.

Noticed that the protobuf files are out of sync with ones generated by 1.2.0 protoc go plugin.

The cause for these files seem to be related to release processes, e.g. [0.9.0-beta1 preperation](https://github.com/hashicorp/nomad/commit/ecec3d38de6ca72eea68d9737d7199cf67bbfe3e#diff-da4da188ee496377d456025c2eab4e87), and [0.9.0-beta3 preperation](https://github.com/hashicorp/nomad/commit/b849d84f2fc8b47c5f5b0e387bff4fa09c3bca6e).

This restores the changes to that of the pinned protoc version and fails build if protobuf files are out of sync.  Sample failing Travis job is that of the first commit change: https://travis-ci.org/hashicorp/nomad/jobs/506285085

Set shell to sh which is present by default on freebsd. Also set
networking to host dhcp due to limitations with NFS sharing:
https://github.com/hashicorp/vagrant/issues/9063

Fix bug with score metadata overridden during inplace upgrades

Fix regression with requiring docker auth email

This fixes a regression in 0.9 beta3 compared to 0.8.7 in validating
docker auth config

Fix task/logmon leak after crash

Some of the context uses in TR hooks are useless (Killed during Stop
never seems meaningful).

None of the hooks are interruptable for graceful shutdown which is
unfortunate and probably needs fixing.