/usr/share/one/websockify/websocketproxy.py is in opennebula-sunstone 4.12.3+dfsg-3.1build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/one/websockify/../../../lib/python2.7/dist-packages/websockify/websocketproxy.py