Added wrapper for action 'handle_forwarded port_collisions'.

It allows to skip calling the builtin action if port forwarding is not supported (PD < 10)

lib/vagrant-parallels/action.rb

@@ -306,6 +306,7 @@ def self.action_simple_reboot
 
       autoload :Boot, File.expand_path("../action/boot", __FILE__)
       autoload :HandleGuestTools, File.expand_path("../action/handle_guest_tools", __FILE__)
+      autoload :HandleForwardedPortCollisions, File.expand_path("../action/handle_forwarded_port_collisions.rb", __FILE__)
       autoload :ClearNetworkInterfaces, File.expand_path("../action/clear_network_interfaces", __FILE__)
       autoload :ClearForwardedPorts, File.expand_path("../action/clear_forwarded_ports", __FILE__)
       autoload :Customize, File.expand_path("../action/customize", __FILE__)

lib/vagrant-parallels/action/handle_forwarded_port_collisions.rb

@@ -0,0 +1,24 @@
+module VagrantPlugins
+  module Parallels
+    module Action
+      class HandleForwardedPortCollisions < Vagrant::Action::Builtin::HandleForwardedPortCollisions
+        def initialize(app, env)
+          @app = app
+          @logger = Log4r::Logger.new('vagrant_parallels::action::handle_port_collisions')
+        end
+
+        # This middleware just wraps the builtin action and allows to skip it if
+        # port forwarding is not supported for current Parallels Desktop version.
+        def call(env)
+          # Port Forwarding feature is available only with PD >= 10
+          if !env[:machine].provider.pd_version_satisfies?('>= 10')
+            return @app.call(env)
+          end
+
+          # Call the builtin action
+          super
+        end
+      end
+    end
+  end
+end