tests: make nice_stdout print failing task line number

tests/ansible/lib/callback/nice_stdout.py

@@ -2,6 +2,7 @@ from __future__ import unicode_literals
 import os
 import io
 
+from ansible import constants as C
 from ansible.module_utils import six
 
 try:
@@ -65,3 +66,34 @@ class CallbackModule(DefaultModule):
             import traceback
             traceback.print_exc()
             raise
+
+    def v2_runner_on_failed(self, result, ignore_errors=False):
+        delegated_vars = result._result.get('_ansible_delegated_vars')
+        self._clean_results(result._result, result._task.action)
+
+        if self._play.strategy == 'free' and self._last_task_banner != result._task._uuid:
+            self._print_task_banner(result._task)
+
+        self._handle_exception(result._result)
+        self._handle_warnings(result._result)
+
+        if result._task.loop and 'results' in result._result:
+            return
+
+        if delegated_vars:
+            msg = "[%s -> %s]: FAILED! => %s" % (
+                result._host.get_name(),
+                delegated_vars['ansible_host'],
+                self._dump_results(result._result),
+            )
+        else:
+            msg = "[%s]: FAILED! => %s" % (
+                result._host.get_name(),
+                self._dump_results(result._result),
+            )
+
+        s = "fatal: %s: %s" % (
+            result._task.get_path() or '(dynamic task)',
+            msg,
+        )
+        self._display.display(s, color=C.COLOR_ERROR)