test__execmodules.py: use walk_modules() function

greentest/test__execmodules.py

 import os
+import sys
 import traceback
+from greentest import walk_modules
 
-base = '../gevent'
-modules = set()
 
-for path, dirs, files in os.walk(base):
-    package = 'gevent' + path.replace(base, '').replace('/', '.')
-    modules.add((package, os.path.join(path, '__init__.py')))
-    for f in files:
-        module = None
-        if f.endswith('.py'):
-            module = f[:-3]
-        if module:
-            modules.add((package + '.' + module, os.path.join(path, f)))
-
-for m, path in modules:
-    print m, path
+for path, module in walk_modules():
+    sys.stderr.write('%s %s\n' % (module, path))
     try:
         execfile(path)
     except Exception: