Nice error messages if VBoxManage command fails

lib/vagrant/driver/virtualbox.rb

@@ -267,8 +267,7 @@ module Vagrant
         # If the command was a failure, then raise an exception that is
         # nicely handled by Vagrant.
         if r.exit_code != 0
-          # TODO: Inherit from VagrantError
-          raise Exception, "FAILURE: #{r.stderr}"
+          raise Errors::VBoxManageError, :command => command.inspect
         end
 
         # Return the output

lib/vagrant/errors.rb

@@ -300,6 +300,11 @@ module Vagrant
       error_key(:vagrantfile_syntax_error)
     end
 
+    class VBoxManageError < VagrantError
+      status_code(59)
+      error_key(:vboxmanage_error)
+    end
+
     class VirtualBoxInvalidVersion < VagrantError
       status_code(17)
       error_key(:virtualbox_invalid_version)

templates/locales/en.yml

@@ -124,6 +124,13 @@ en:
         message is reproduced below for convenience:
 
         %{file}
+      vboxmanage_error: |-
+        There was an error executing the following command with VBoxManage:
+
+        %{command}
+
+        For more information on the failure, enable detailed logging with
+        VAGRANT_LOG.
       virtualbox_invalid_version: |-
         Vagrant has detected that you have VirtualBox version %{version} installed!
         Vagrant requires that you use at least VirtualBox version 4.1. Please install