remove module-level logger in zmq.iostream

This could cause infinite recursion of sys.stderr logging debug messages to sys.stderr.

IPython/zmq/iostream.py

@@ -1,4 +1,3 b''
-import logging
 import sys
 import time
 from io import StringIO
@@ -11,9 +10,6 b' from IPython.utils import io'
 # Globals
 #-----------------------------------------------------------------------------
 
-# Module-level logger
-logger =  logging.getLogger(__name__)
-
 #-----------------------------------------------------------------------------
 # Stream classes
 #-----------------------------------------------------------------------------
@@ -48,7 +44,6 b' class OutStream(object):'
                 content = {u'name':self.name, u'data':data}
                 msg = self.session.send(self.pub_socket, u'stream', content=content,
                                        parent=self.parent_header, ident=self.topic)
-                logger.debug(msg)
 
                 self._buffer.close()
                 self._new_buffer()