Implement compatibility with buildout2

  And it is also backward compatible with buildout<2 and with current tests

slapos/recipe/cmmi/__init__.py

@@ -13,7 +13,15 @@ import subprocess
 import sys
 import zc.buildout
 from zc.buildout.download import Download
-
+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)
 
 class Recipe(object):
     """zc.buildout recipe for compiling and installing software"""
@@ -51,8 +59,8 @@ class Recipe(object):
         options['url'] = options.get('url', '').strip()
         options['path'] = options.get('path', '').strip()
         options['promises'] = options.get('promises', '')
-        default_strip = buildout['buildout'].query_bool('strip', 'true')
-        options['strip'] = options.query_bool('strip', default_strip and 'true' or 'false')
+        default_strip = bool_option(buildout['buildout'], 'strip', 'true')
+        options['strip'] = bool_option(options, 'strip', default_strip and 'true' or 'false')
 
         # Check dependencies, all the dependent parts will be installed first. It
         # seems once part is referenced, for example, self.buildout[part], it will