Reload sleeps 1 sec after halt to avoid FFI exception

lib/vagrant/actions/vm/reload.rb

@@ -11,6 +11,13 @@ module Vagrant
             @runner.add_action(action_klass)
           end
         end
+
+        def after_halt
+          # This sleep is here to allow the VM to clean itself up. There appears
+          # nothing [obvious] in the VirtualBox API to automate this. For now, this
+          # is an interim solution.
+          sleep 1
+        end
       end
     end
   end