Use the same log level as the other fd event messages

This should not be a warning because it only reports
on the internal state of supervisord fd event handling;
it's not something the user can affect.

supervisor/supervisord.py

@@ -225,7 +225,7 @@ def runforever(self):
                 else:
                     # if the fd is not in combined_map, we should unregister it. otherwise,
                     # it will be polled every time, which may cause 100% cpu usage
-                    self.options.logger.warn('unexpected read event from fd %r' % fd)
+                    self.options.logger.blather('unexpected read event from fd %r' % fd)
                     try:
                         self.options.poller.unregister_readable(fd)
                     except:
@@ -246,7 +246,7 @@ def runforever(self):
                     except:
                         combined_map[fd].handle_error()
                 else:
-                    self.options.logger.warn('unexpected write event from fd %r' % fd)
+                    self.options.logger.blather('unexpected write event from fd %r' % fd)
                     try:
                         self.options.poller.unregister_writable(fd)
                     except: