Extract functions from path recipe module so that step can depend on it

scripts/slave/recipe_modules/path/example.py

Index: scripts/slave/recipe_modules/path/example.py
diff --git a/scripts/slave/recipe_modules/path/example.py b/scripts/slave/recipe_modules/path/example.py
index 72f243328c1cb48f30d4299cc2c92adf9d3476c5..c1c0b3e94743b5fa2dcb0b9ef1481ecbc67a6ec2 100644
--- a/scripts/slave/recipe_modules/path/example.py
+++ b/scripts/slave/recipe_modules/path/example.py
@@ -13,26 +13,10 @@ def GenSteps(api):
   api.step('step1',
                   ['/bin/echo', str(api.path['slave_build'].join('foo'))])
 
-  # listdir demo.
-  result = api.path.listdir('fake dir', '/fake/dir')
-  for element in result:
-    api.step('manipulate %s' % str(element), ['some', 'command'])
-
-  # mkdtemp demo.
-  for prefix in ('prefix_a', 'prefix_b'):
-    # Create temp dir.
-    temp_dir = api.path.mkdtemp(prefix)
-    assert api.path.exists(temp_dir)
-    # Make |temp_dir| surface in expectation files.
-    api.step('print %s' % prefix, ['echo', temp_dir])
-
   # module.resource(...) demo.
   api.step('print resource',
            ['echo', api.path.resource('dir', 'file.py')])
 
-  # rmwildcard demo
-  api.path.rmwildcard('*.o', api.path['slave_build'])
-
 
 def GenTests(api):
   # This line is for code coverage.