provisioners/chef: use real variable in delete from chef sever [GH-2300]

CHANGELOG.md

@@ -25,6 +25,7 @@ BUG FIXES:
   - provisioners/ansibe: Extra vars are converted to strings. [GH-2244]
   - provisioners/chef: Propagate disabling color if Vagrant has no color
     enabled. [GH-2246]
+  - provisioners/chef: Delete from chef server exception fixed. [GH-2300]
   - provisioners/puppet: Work with restrictive umask. [GH-2241]
   - provisioners/salt: Remove bootstrap definition file on each run in
     order to avoid permissions issues. [GH-2290]

plugins/provisioners/chef/provisioner/chef_client.rb

@@ -105,6 +105,7 @@ module VagrantPlugins
         end
 
         def delete_from_chef_server(deletable)
+          env = @machine.env
           node_name = config.node_name || env[:vm].config.vm.host_name
           env[:ui].info(I18n.t(
             "vagrant.provisioners.chef.deleting_from_server",