Changed recipe_modules base paths to be abstract entities in their own right.

scripts/slave/recipe_modules/path/test_api.py

Index: scripts/slave/recipe_modules/path/test_api.py
diff --git a/scripts/slave/recipe_modules/path/test_api.py b/scripts/slave/recipe_modules/path/test_api.py
index ba1ec3c172cf4387801da7fc357c84a79e8b264e..5e80bfa09a4a8419ab2c55484e17898c97af0ef4 100644
--- a/scripts/slave/recipe_modules/path/test_api.py
+++ b/scripts/slave/recipe_modules/path/test_api.py
@@ -1,5 +1,5 @@
 from slave import recipe_test_api
-from slave.recipe_config_types import Path
+from slave.recipe_config_types import Path, NamedBasePath
 
 class PathTestApi(recipe_test_api.RecipeTestApi):
   @recipe_test_api.mod_test_data
@@ -9,7 +9,7 @@ class PathTestApi(recipe_test_api.RecipeTestApi):
     return paths
 
   def __getitem__(self, name):
-    return Path(name, _bypass=True)
+    return Path(NamedBasePath(name))
 
   def listdir(self, files):
     def listdir_callback():