Merge pull request #2854 from berendt/vagrantfile_hostname

[Vagrantfile] set the hostname to 'terraform'

Vagrantfile

@@ -42,6 +42,7 @@ SCRIPT
 
 Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
   config.vm.box = "chef/ubuntu-12.04"
+  config.vm.hostname = "terraform"
 
   config.vm.provision "shell", inline: $script, privileged: false
   config.vm.synced_folder '.', '/opt/gopath/src/github.com/hashicorp/terraform'