isolate core HostsFile module code into its own class

lib/vagrant-hostmanager/hosts_file.rb

@@ -3,6 +3,23 @@ require 'tempfile'
 module VagrantPlugins
   module HostManager
     module HostsFile
+
+      def update_guest(machine)
+        Updater.new(@global_env, @config, @provider).update_guest(machine)
+      end
+
+      def update_host
+        Updater.new(@global_env, @config, @provider).update_host
+      end
+
+      class Updater
+
+        def initialize(global_env, config, provider)
+          @global_env = global_env
+          @config = config
+          @provider = provider
+        end
+
         def update_guest(machine)
           return unless machine.communicate.ready?
 
@@ -192,4 +209,5 @@ module VagrantPlugins
         end
       end
     end
+  end
 end