Mention #2361 in upgrade notes.

build: Add Vault as an external test dependency

deps: Update github.com/shirou/gopsutil/...

Fix test deadlock due to alloc runner not running

Don't actualy call AllocRunner.Run() because that executes so much
unneeded code for this test. Manually close the waitCh to simulate Run()
exiting.

This adds support for Illumos for memory and host information, which
allows the fingerprinting tests to pass. It also contains fixes for
FreeBSD.

Broken things fixed

F arm misc

This PR:
* Uses Go 1.8 executable lookup
* Stores any err message from stats init method
* Allows overriding of Cpu Compute for hosts where it can't be detected

Limit parallelism during garbage collection

Replace `_` with `-` in task names for rkt volumes

Skip inplace update on terminal batch allocation

Fix #2445

Close #2445 - typo in docs

[needs testing] make bin creates a release binary for the host arch

Vault is required for the fingerprinting tests but is not currently
installed by the build process. This commit adds a new category of
external tools for test dependencies and `go get`'s them during the
bootstrap.

We also fix the syntax of the Makefile to use tabs throughout.

deps: Update github.com/shirou/gopsutil

Return AgentSelf struct from Agent.Self() instead of map