[loader] Make recipe engine support examples/ module subdir

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

 [
   {
     "cmd": [
       "echo",
       "Hello World"
     ],
     "name": "hello"
   },
   {
     "cmd": [
@@ skipping 134 matching lines @@
       "nothing"
     ],
     "name": "no-op"
   },
   {
     "name": "$result",
     "reason": "Invalid Step Data Access: StepDataAttributeError('The recipe attempted to access missing step data \"json\" for step \"no-op\". Please examine that step for errors.',)",
     "status_code": -1
   }
 ]