tree bdb072dc5069c3703ca39a446f27fac958e9e04e
parent f46bcdf5e4510eec7f09579842b22745f093d676
author Balazs Gibizer <balazs.gibizer@est.tech> 1633425750 +0200
committer Balazs Gibizer <balazs.gibizer@est.tech> 1636029175 +0100

Remove race from wait_for_interface_detach waiter

Nova list the interfaces attached to a server based on list of ports
bound to the server. However during detach interface nova unbounds the
port first and then deallocates the resources used by that port in
placement. The current detach waiter only waits until the interface
disappears from the interface list. This can cause that waiter returns
before the resource allocation is removed from placement cause a race in
the test asserting such allocation.

So this patch changes the waiter to wait for the successful detach
os-instance-action event for the server as that is only recorded after
the port is fully deallocated.

blueprint: qos-minimum-guaranteed-packet-rate
Change-Id: I8740f8e0cc18ffea31a9a068bccee50bf4e6fe28