Adjust tests for buildout 3

See merge request nexedi/slapos.recipe.template!10

slapos/recipe/template/README.jinja2.txt

@@ -129,7 +129,8 @@ Remove rendered file and re-render::
     Uninstalling template.
     Installing template.
     The template install returned None.  A path or iterable os paths should be returned.
-    Unused options for template: 'extra'.
+    Section `template` contains unused option(s): 'extra'.
+    This may be an indication for either a typo in the option's name or a bug in the used recipe.
 
 Template was not rendered::
 
@@ -145,7 +146,8 @@ Removing the canary allows template to be re-rendered::
     Uninstalling template.
     Installing template.
     The template install returned None.  A path or iterable os paths should be returned.
-    Unused options for template: 'extra'.
+    Section `template` contains unused option(s): 'extra'.
+    This may be an indication for either a typo in the option's name or a bug in the used recipe.
     >>> cat('foo_once')
     dummy
 
@@ -249,6 +251,7 @@ Let's create a sample recipe modifying its option dict::
     ... from setuptools import setup
     ...
     ... setup(name='samplerecipe',
+    ...       py_modules=['main'],
     ...       entry_points = {
     ...           'zc.buildout': [
     ...                'default = main:Recipe',

slapos/recipe/template/tests.py

@@ -79,6 +79,7 @@ def test_suite():
         normalize_setuptools_42,
         normalize_cryptography_3_on_python2,
         normalize_server,
+        testing.root_logger_messages,
       ) + normalize_networkcache),
     ) for filename in [
       'README.txt',