Add middleware to force ssh disconnect

lib/vagrant-lxc/action.rb

@@ -6,6 +6,7 @@ require 'vagrant-lxc/action/check_running'
 require 'vagrant-lxc/action/create'
 require 'vagrant-lxc/action/created'
 require 'vagrant-lxc/action/destroy'
+require 'vagrant-lxc/action/disconnect'
 require 'vagrant-lxc/action/forced_halt'
 require 'vagrant-lxc/action/handle_box_metadata'
 require 'vagrant-lxc/action/is_running'
@@ -123,6 +124,7 @@ module Vagrant
           # b.use CheckLXC
           b.use Vagrant::Action::Builtin::Call, Created do |env, b2|
             if env[:result]
+              b2.use Disconnect
               b2.use Vagrant::Action::Builtin::Call, Vagrant::Action::Builtin::GracefulHalt, :stopped, :running do |env2, b3|
                 if !env2[:result] && env2[:machine].provider.state.running?
                   b3.use ForcedHalt

lib/vagrant-lxc/action/disconnect.rb

@@ -0,0 +1,14 @@
+module Vagrant
+  module LXC
+    module Action
+      class Disconnect < BaseAction
+        def call(env)
+          @app.call env
+          # FIXME: Vagrant >= 1.1.3 should not need this
+          #          https://github.com/mitchellh/vagrant/compare/715539eac30bc9ae62ddbb6337d13f036f7b774d...ec1bae0#L2R128
+          env[:machine].instance_variable_set(:@communicator, nil)
+        end
+      end
+    end
+  end
+end