Public bug reported:


After a network driver restart, the network interfaces are deleted and
added again, the udev should notify that new interface was added. then
the interface service should be started accordingly.

Udev doesn't notify about that new interface is added and the interface service 
doesn't start.

More details:

We see this issue when using Mellanox OFED package.
Mellanox OFED add a service per network device and add udev rule to start this 
service when the interface added.
After driver restart ("/etc/init.d/openibd restart") the network devices 
doesn't loaded, since udev doesn't notify.

The system should run from udev rules, since once the driver creates an
interface, there should be a udev event saying a new interface is added,
then this script will be ran by udev (the OS).

" /bin/systemctl --no-block start mlnx_interface_mgr@ib0.service "

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New

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  [Bionic]udev stop notifying when network interface added

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