Removing auto install script

vagrant/release/devstack/Vagrantfile

@@ -62,13 +62,6 @@ Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
     vb.customize ["modifyvm", :id, "--natdnshostresolver1", "on"]
   end
   # Use vagrant-vbguest plugin to make sure Guest Additions are in sync
-  if !Vagrant.has_plugin?('vagrant-vbguest') && ENV['SKIP'] != 'true'
-    print "Installing vagrant plugin vagrant-vbguest..."
-    %x(bash -c "export SKIP=true; vagrant plugin install vagrant-vbguest") unless Vagrant.has_plugin?('vagrant-vbguest') || ENV['SKIP'] == 'true'
-    puts "Done!"
-    puts "Please re-run your vagrant command again..."
-    exit
-  end
   config.vbguest.auto_reboot = true
   config.vbguest.auto_update = true