Back in August, HenryG committed a useful change  to networking-calico
(and I assume to other neutron projects) to show deprecation warnings for
imports from neutron that should now be from neutron-lib. But then in late
August / early September, those deprecation warnings disappeared again -
and sadly it wasn't because the imports had been fixed to use neutron-lib.
Have any other projects seen that too, and does anyone know what caused
Specifically, the gate job for a change merged on August 15th shows those
warnings , but the gate job for the next merged change, on September
8th, does not show those warnings .
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