Add ShutdownDomain action and use during halt sequence

This adds in a ShutdownDomain action which allows for the
    GracefulHalt action to attempt to shutdown the domain. If
    it does not transition to domain successfully to a shutoff
    state, the ShutdownDomain action is used to "nicely" shutdown
    the domain. Likewise, if that action fails to transition the
    domain, the HaltDomain action will be used to forcibly stop it.

lib/vagrant-libvirt/action.rb

@@ -145,7 +145,11 @@ module VagrantPlugins
               # VM is running, halt it.
               b3.use Call, GracefulHalt, :shutoff, :running do |env3, b4|
                 if !env3[:result]
-                  b4.use HaltDomain
+                  b4.use Call, ShutdownDomain, :shutoff, :running do |env4, b5|
+                    if !env4[:result]
+                      b5.use HaltDomain
+                    end
+                  end
                 end
               end
             end
@@ -352,6 +356,7 @@ module VagrantPlugins
       autoload :ForwardPorts, action_root.join('forward_ports')
       autoload :ClearForwardedPorts, action_root.join('forward_ports')
       autoload :HaltDomain, action_root.join('halt_domain')
+      autoload :ShutdownDomain, action_root.join('shutdown_domain')
       autoload :HandleBoxImage, action_root.join('handle_box_image')
       autoload :HandleStoragePool, action_root.join('handle_storage_pool')
       autoload :RemoveLibvirtImage, action_root.join('remove_libvirt_image')

lib/vagrant-libvirt/action/shutdown_domain.rb

@@ -0,0 +1,31 @@
+require 'log4r'
+
+module VagrantPlugins
+  module ProviderLibvirt
+    module Action
+      # Shutdown the domain.
+      class ShutdownDomain
+        def initialize(app, _env, target_state, source_state)
+          @logger = Log4r::Logger.new('vagrant_libvirt::action::shutdown_domain')
+          @target_state = target_state
+          @source_state = source_state
+          @app = app
+        end
+
+        def call(env)
+          timeout = env[:machine].config.vm.graceful_halt_timeout
+          domain = env[:machine].provider.driver.connection.servers.get(env[:machine].id.to_s)
+          if env[:machine].state.id == @source_state
+            env[:ui].info(I18n.t('vagrant_libvirt.shutdown_domain'))
+            domain.shutdown
+            domain.wait_for(timeout) { !ready? }
+          end
+
+          env[:result] = env[:machine].state.id == @target_state
+
+          @app.call(env)
+        end
+      end
+    end
+  end
+end

locales/en.yml

@@ -29,6 +29,8 @@ en:
       Poweroff domain.
     destroy_domain: |-
       Removing domain...
+    shutdown_domain: |-
+      Attempting direct shutdown of domain...
     halt_domain: |-
       Halting domain...
     resuming_domain: |-