* Check and install libvirt with Homebrew
macOS does not have apt, dnf or yum. Add checking for homebrew for
installing libvirt.
* Use platform timeout for tests
* Add timeout detection to test/util.sh
* Use $timeout for shell test requiring timeout
On Nixos and GNUIX-SD, bash is chroot in package store path.
In my case : /nix/store/qvccmr6fsis4kqlvlk8pb1c8c0r0cwai-system-path/bin/bash
In any case, using `/usr/bin/env bash` is the recommended way to get bash
portable across UNIX-like systems.
This lets some golint errors in, but fails if you're over a certain
threshold. The current threshold of 15% (of LOC) is arbitrary and
subject to change. The algorithm should be extended to check a range of
commits, although it's unclear how to detect what range of commits make
up a patch set.
We need to use sudo: required, and dist: trusty to avoid old versions of
bash in travis which don't support the -n argument to the `wait` shell
built-in.
We had to disable the -e checks in etcd.sh since the killall || killall
parts were causing those to trigger in travis.
