publisher: replace an early call to logger by a print statement

wcs/qommon/publisher.py

@@ -743,7 +743,7 @@ class QommonPublisher(Publisher):
                 try:
                     imp.load_module(modulename, fp, pathname, description)
                 except:
-                    self.get_app_logger().warn('failed to load extra module: %s' % modulename)
+                    print >> sys.stderr, 'failed to load extra module: %s' % modulename
                     if fp:
                         fp.close()
     load_extra_dirs = classmethod(load_extra_dirs)