/lib/udev/rules.d/xen-openvswitch-nova.rules is in nova-xcp-network 2012.1-0ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 | SUBSYSTEM=="xen-backend", KERNEL=="vif*", RUN+="/usr/lib/xcp/scripts/ovs_configure_vif_flows.py $env{ACTION} %k all"
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