/lib/udev/rules.d/70-iscsi-network-interface.rules is in open-iscsi 2.0.873+git0.3b4b4500-14ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | # run before 80-networking.rules to run before ifupdown
SUBSYSTEM=="net", ACTION=="add", RUN+="/lib/open-iscsi/net-interface-handler start"
SUBSYSTEM=="net", ACTION=="remove", RUN+="/lib/open-iscsi/net-interface-handler stop"
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