Vagrantfile resize handling

This implements the resize in a more "vagrant way", by using a
plugin that is meant for resizing the instance's disk.

Advantages:
- We don't have to ship the resize code contnet
- It works when stopping the machine and starting it up again.

Change-Id: I4f725131f15c57f176201aac0d967459792ebe5a

Vagrantfile

@@ -2,47 +2,15 @@ Vagrant.configure(2) do |config|
 
   config.vm.define "ubuntu1604" do |xenial|
     xenial.vm.box = "ubuntu/xenial64"
+    # Expand the disk to 60GB. You'll need
+    # the plugin disksize. Please run:
+    # vagrant plugin install vagrant-disksize
+    xenial.disksize.size = '60GB'
     xenial.vm.provider "virtualbox" do |v|
 
-      v.name = "OpenStack-Ansible_Ubuntu-16.04_#{Time.now.getutc.to_i}"
       v.memory = 8192
       v.cpus = 4
 
-      image_path = "#{ENV["HOME"]}/VirtualBox VMs/#{v.name}"
-      image_name = 'ubuntu-xenial-16.04-cloudimg'
-
-      # We clone the image to a resizable format
-      v.customize [
-        "clonehd", "#{image_path}/#{image_name}.vmdk",
-                   "#{image_path}/#{image_name}.vdi",
-        "--format", "VDI"
-      ]
-
-      # Then resize it to 60 GB
-      v.customize [
-        "modifymedium", "disk",
-        "#{image_path}/#{image_name}.vdi",
-        "--resize", 60 * 1024
-      ]
-
-      # Then attach it as the primary disk
-      v.customize [
-        "storageattach", :id,
-        "--storagectl", "SCSI Controller",
-        "--port", "0",
-        "--device", "0",
-        "--type", "hdd",
-        "--nonrotational", "on",
-        "--medium", "#{image_path}/#{image_name}.vdi"
-      ]
-
-      # Then remove the original disk
-      v.customize [
-        "closemedium", "disk",
-        "#{image_path}/#{image_name}.vmdk",
-        "--delete"
-      ]
-
       # Now we can execute the build
       config.vm.provision "shell", inline: <<-SHELL
         sudo su -
@@ -55,47 +23,12 @@ Vagrant.configure(2) do |config|
 
   config.vm.define "centos7" do |centos7|
     centos7.vm.box = "centos/7"
+    centos7.disksize.size = '60GB'
     centos7.vm.provider "virtualbox" do |v|
 
-      v.name = "OpenStack-Ansible_CentOS-7_#{Time.now.getutc.to_i}"
       v.memory = 8192
       v.cpus = 4
 
-      image_path = "#{ENV["HOME"]}/VirtualBox VMs/#{v.name}"
-      image_name = 'centos-7-1-1.x86_64'
-
-      # We clone the image to a resizable format
-      v.customize [
-        "clonehd", "#{image_path}/#{image_name}.vmdk",
-                   "#{image_path}/#{image_name}.vdi",
-        "--format", "VDI"
-      ]
-
-      # Then resize it to 60 GB
-      v.customize [
-        "modifymedium", "disk",
-        "#{image_path}/#{image_name}.vdi",
-        "--resize", 60 * 1024
-      ]
-
-      # Then attach it as the primary disk
-      v.customize [
-        "storageattach", :id,
-        "--storagectl", "IDE Controller",
-        "--port", "0",
-        "--device", "0",
-        "--type", "hdd",
-        "--nonrotational", "on",
-        "--medium", "#{image_path}/#{image_name}.vdi"
-      ]
-
-      # Then remove the original disk
-      v.customize [
-        "closemedium", "disk",
-        "#{image_path}/#{image_name}.vmdk",
-        "--delete"
-      ]
-
       # Now we can execute the build
       config.vm.provision "shell", inline: <<-SHELL
         sudo su -