make code setup debug env

Signed-off-by: Nico Schottelius <nico@kr.ethz.ch>

doc/man/cdist-reference.text.sh

@@ -170,7 +170,7 @@ __debug::
    If this variable is setup, cdist runs in debug mode.
    You can use this information, to only output stuff in debug
    mode as well.
-   Available for: initial manifest, type manifest
+   Available for: initial manifest, type manifest, gencode, code
 __explorer::
    Directory that contains all global explorers.
    Available for: explorer

lib/cdist/core/code.py

@@ -92,6 +92,9 @@ class Code(object):
             '__global': self.local.out_path,
         }
 
+        if log.getEffectiveLevel() == logging.DEBUG:
+            self.env.update({'__debug': "yes" })
+
     def _run_gencode(self, cdist_object, which):
         cdist_type = cdist_object.type
         script = os.path.join(self.local.type_path, getattr(cdist_type, 'gencode_%s_path' % which))