Drop compatibility code for zc.buildout<2

setup.py

@@ -41,7 +41,7 @@ setup(
     include_package_data=True,
     zip_safe=False,
     install_requires=[
-        'zc.buildout',
+        'zc.buildout>=2',
         'setuptools',
         'slapos.recipe.build>=0.40',
     ],

slapos/recipe/cmmi/__init__.py

@@ -12,15 +12,7 @@ import stat
 import subprocess
 import sys
 import zc.buildout
-try:
-  # import from zc.buildout>2
-  from zc.buildout.buildout import bool_option
-except:
-  def bool_option(options, name, defaults=None):
-    if getattr(options, "query_bool", None) is None:
-      from zc.buildout.buildout import Options
-      options = Options({}, "options", options)
-    return options.query_bool(name, defaults)
+from zc.buildout.buildout import bool_option
 
 startup_environ = os.environ.copy()