Spread out methods in provision so subclass can override

lib/vagrant/action/builtin/provision.rb

@@ -50,6 +50,15 @@ module Vagrant
               next if env[:provision_types] && \
                 !env[:provision_types].include?(type_map[p])
 
+              run_provisioner(p)
+            end
+          end
+        end
+
+        # This is pulled out into a seperate method so that users can
+        # subclass and implement custom behavior if they'd like around
+        # this step.
+        def run_provisioner(p)
           env[:ui].info(I18n.t("vagrant.actions.vm.provision.beginning",
                                :provisioner => p.class))
 
@@ -59,5 +68,3 @@ module Vagrant
     end
   end
 end
-  end
-end