Repeating tracebacks in journal on fresh containerized deployment

Issue

• After fresh Red Hat OpenStack Platform 13 deployment, we can see repeating Tracebacks in the docker.service in the controllers:

systemctl status docker.service
..

Oct 14 21:35:33 controller-0 dockerd-current[19433]:     self.RequestHandlerClass(request, client_address, self)
Oct 14 21:35:33 controller-0 dockerd-current[19433]:   File "/usr/lib64/python2.7/SocketServer.py", line 651, in __init__
Oct 14 21:35:33 controller-0 dockerd-current[19433]:     self.finish()
Oct 14 21:35:33 controller-0 dockerd-current[19433]:   File "/usr/lib64/python2.7/SocketServer.py", line 710, in finish
Oct 14 21:35:33 controller-0 dockerd-current[19433]:     self.wfile.close()
Oct 14 21:35:33 controller-0 dockerd-current[19433]:   File "/usr/lib64/python2.7/socket.py", line 279, in close
Oct 14 21:35:33 controller-0 dockerd-current[19433]:     self.flush()
Oct 14 21:35:33 controller-0 dockerd-current[19433]:   File "/usr/lib64/python2.7/socket.py", line 303, in flush
Oct 14 21:35:33 controller-0 dockerd-current[19433]:     self._sock.sendall(view[write_offset:write_offset+buffer_size])
Oct 14 21:35:33 controller-0 dockerd-current[19433]: error: [Errno 32] Broken pipe