json[l] callback: add play/task path info

Add the play and task path info (i.e., filename and line number) to
the JSON that is emitted from the json and jsonl callback plugins,
allowing more accurate post-mortem analysis.

Signed-off-by: Jeff Squyres <jsquyres@cisco.com>

plugins/callback/json.py

@@ -67,6 +67,7 @@ class CallbackModule(CallbackBase):
             'play': {
                 'name': play.get_name(),
                 'id': to_text(play._uuid),
+                'path': to_text(play.get_path()),
                 'duration': {
                     'start': current_time()
                 }
@@ -79,6 +80,7 @@ class CallbackModule(CallbackBase):
             'task': {
                 'name': task.get_name(),
                 'id': to_text(task._uuid),
+                'path': to_text(task.get_path()),
                 'duration': {
                     'start': current_time()
                 }