[loader] Make recipe engine support examples/ module subdir

recipe_modules/step/examples/full.expected/defer_results.json

 [
   {
     "cmd": [
       "echo",
       "Hello World"
     ],
     "name": "hello"
   },
   {
     "cmd": [
@@ skipping 109 matching lines @@
     ],
     "name": "testb"
   },
   {
     "name": "$result",
     "reason": "You can catch step failures.",
     "recipe_result": null,
     "status_code": 1
   }
 ]