network-vif-plugged and friends are not well documented

Bug #1840147 reported by YAMAMOTO Takashi on 2019-08-14
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This bug affects 1 person
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Bug Description

network-vif-plugged and friends are not well documented.
the timing when those events are sent varies among drivers.
inter-project api like this should be defined and documented super-clearly.

the behaviour isn't consistent even within reference implementations.
nova folks call them bind-time events vs plug-time events.
https://review.opendev.org/#/c/667177/

networking-midonet always make compute ports ACTIVE. (create-time events?)
https://github.com/openstack/networking-midonet/blob/stable/stein/midonet/neutron/ml2/mech_driver.py#L178
it stopped working recently.
https://bugs.launchpad.net/networking-midonet/+bug/1839169

networking-ovn has a relevant dirty hack.
https://review.opendev.org/#/c/673803/
it has a nice bug description.
https://bugs.launchpad.net/ubuntu/+source/neutron/+bug/1834045

references:
https://wiki.openstack.org/wiki/Nova/ExternalEventAPI

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