added tests

remove loop var as normal exit would

lib/ansible/executor/task_executor.py

@@ -385,6 +385,8 @@ class TaskExecutor:
                 cond = Conditional(loader=self._loader)
                 cond.when = self._task.loop_control.get_validated_value('until', self._task.loop_control._until, self._task.loop_control.until, templar)
                 if cond.evaluate_conditional(templar, task_vars):
+                    # delete loop vars before exiting loop
+                    del task_vars[loop_var]
                     break
 
             # done with loop var, remove for next iteration

test/integration/targets/loop_control/runme.sh

@@ -10,3 +10,5 @@ bar_label'
 [ "$(ansible-playbook label.yml "$@" |grep 'item='|sed -e 's/^.*(item=looped_var \(.*\)).*$/\1/')" == "${MATCH}" ]
 
 ansible-playbook extended.yml "$@"
+
+ansible-playbook until.yml "$@"

test/integration/targets/loop_control/until.yml

@@ -0,0 +1,17 @@
+- hosts: localhost
+  gather_facts: false
+  tasks:
+    - debug: var=item
+      changed_when: false
+      loop:
+        - 1
+        - 2
+        - 3
+        - 4
+      loop_control:
+        until: item >= 2
+      register: untiltest
+
+    - assert:
+        that:
+            - untiltest|length == 2