Seth Vargo 41d61120a5
guests/arch: Change hostname in one command
This commit updates the procedure for changing the hostname on arch
guests to occur in a single command. Previously, setting the hostname
and adding the value of the hostname to the /etc/hosts file was done in
two different uploads. This reduces the cycle to a single upload, making
provisioning a bit faster.

Additionally, this changes the behavior of the /etc/hosts file to:

1. Not remove localhost as an alias of 127.0.0.1
2. Prepend our custom hostname before localhost

The resulting /etc/hosts file will look something like:

127.0.0.1 my-host.example.com my-host
127.0.0.1 localhost.mydomain localhost

Tested against `terrywang/archlinux` using the following Vagrantfile:

```ruby
Vagrant.configure(2) do |config|
  config.vm.box = "terrywang/archlinux"
  config.vm.hostname = "banana-ramama.example.com"

  config.vm.network "private_network", type: "dhcp"

  config.vm.network "private_network", ip: "33.33.33.10"

  config.vm.provision "file", source: "Vagrantfile", destination: "/tmp/vf"
  config.vm.provision "shell", inline: "echo hi"
end
```
2016-06-06 11:58:24 -04:00
..
2016-03-17 20:48:08 -05:00

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