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For the Kuryr project, in order to support blocking until vifs are plugged
in (that is adding config options similar to the following options define
in Nova: vif_plugging_is_fatal and vif_plugging_timeout), we need to detect
that the Neutron plugin being used is done with plugging a given vif.

Here are a few options:

1- The simplest approach seems to be polling for the status of the Neutron
port to become Active. (This may lead to scalability issues but short of
having a specific goal for scalability, it is not clear that will be the
case.)
2- Alternatively, We could subscribe to the message queue and wait for such
a port update event.
3- It was also suggested that we could use l2 agent extension to detect
such an event but that seems to limit us to certain Neutron plugins and
therefore not acceptable.

I was wondering if there are other and better options.

Best,

Mohammad
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