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The MechanismDriver is already in neutron-lib [1] and after inspecting other usages [2] it makes sense to move the rest of the driver_api module over. [1] https://review.openstack.org/#/c/428997/ [2] http://codesearch.openstack.org/?q=from%20neutron%5C.plugins%5C.ml2%20import%20driver_api Change-Id: Ifc829953ef4d5859c3475903965dc08aba42fd9c