Merge pull request #4099 from mitchellh/fix-issue-2476-chef-client-node-cleanup

provisioners/chef: clean bundle env when executing chef client

plugins/provisioners/chef/provisioner/chef_client.rb

@@ -104,14 +104,18 @@ module VagrantPlugins
             "vagrant.provisioners.chef.deleting_from_server",
             deletable: deletable, name: node_name))
 
-          command = ["knife", deletable, "delete", "--yes", node_name]
-          r = Vagrant::Util::Subprocess.execute(*command)
-          if r.exit_code != 0
-            @machine.ui.error(I18n.t(
-              "vagrant.chef_client_cleanup_failed",
-              deletable: deletable,
-              stdout: r.stdout,
-              stderr: r.stderr))
+          # Knife is not part of the current Vagrant bundle, so it needs to run
+          # in the context of the system.
+          Bundler.with_clean_env do
+            command = ["knife", deletable, "delete", "--yes", node_name]
+            r = Vagrant::Util::Subprocess.execute(*command)
+            if r.exit_code != 0
+              @machine.ui.error(I18n.t(
+                "vagrant.chef_client_cleanup_failed",
+                deletable: deletable,
+                stdout: r.stdout,
+                stderr: r.stderr))
+            end
           end
         end
       end