Make recipe module loader non-recursive

recipe_engine/loader.py

Index: recipe_engine/loader.py
diff --git a/recipe_engine/loader.py b/recipe_engine/loader.py
index 8f26265d4b94af2897448db6f2149525a73803f6..b27f454e6f2bff98f5cc28d23f554aa2be51e97c 100644
--- a/recipe_engine/loader.py
+++ b/recipe_engine/loader.py
@@ -345,39 +345,26 @@ def _load_recipe_module_module(path, universe_view):
   # Prevent any modules that mess with sys.path from leaking.
   with env.temp_sys_path():
     sys.modules['%s.DEPS' % fullname] = mod.LOADED_DEPS
-    _recursive_import(
-        path, '%s.%s' % (RECIPE_MODULE_PREFIX, universe_view.package.name))
+    _load_recipe_module_files(path, mod, fullname)
     _patchup_module(modname, mod, universe_view)
 
   return mod
 
 
-def _recursive_import(path, prefix):
-  modname = os.path.splitext(os.path.basename(path))[0]
-  fullname = '%s.%s' % (prefix, modname)
-  mod = _find_and_load_module(fullname, modname, path)
-  if not os.path.isdir(path):
-    return mod
-
+def _load_recipe_module_files(path, mod, prefix):
   for subitem in os.listdir(path):
-    subpath = os.path.join(path, subitem)
-    subname = os.path.splitext(subitem)[0]
-    if os.path.isdir(subpath):
-      if not os.path.exists(os.path.join(subpath, '__init__.py')):
-        continue
-    elif not subpath.endswith('.py') or subitem.startswith('__init__.py'):
-      continue
-
-    submod = _recursive_import(subpath, fullname)
-
-    if not hasattr(mod, subname):
-      setattr(mod, subname, submod)
-    else:
-      prev = getattr(mod, subname)
-      assert submod is prev, (
-        'Conflicting modules: %s and %s' % (prev, mod))
-
-  return mod
+    if subitem in ('api.py', 'test_api.py') or subitem.endswith('config.py'):
+      subpath = os.path.join(path, subitem)
+      subname = os.path.splitext(subitem)[0]
+      fullname = '%s.%s' % (prefix, subname)
+      submod = _find_and_load_module(fullname, subname, subpath)
+
+      if not hasattr(mod, subname):
+        setattr(mod, subname, submod)
+      else:
+        prev = getattr(mod, subname)
+        assert submod is prev, (
+          'Conflicting modules: %s and %s' % (prev, mod))
 
 
 def _patchup_module(name, submod, universe_view):