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This can happen if you are using an alias for your plugin in neutron.conf.

# (StrOpt) Neutron core plugin entrypoint to be loaded from the
# neutron.core_plugins namespace. See setup.cfg for the entrypoint names of the
# plugins included in the neutron source distribution. For compatibility with
# previous versions, the class name of a plugin can be specified instead of its
# entrypoint name.
#
core_plugin = ml2


Its a bug: https://review.openstack.org/#/c/81221/

You can work around it by putting in the full class name for your plugin in neutron.conf.

I think the full class path is neutron.plugins.ml2.plugin.Ml2Plugin but not 100% sure.