Use registry.receives decorator in neutron.db.db_base_plugin_v2
Use registry.receives decorator in neutron.db.db_base_plugin_v2

Switch to registry.receives decorator in neutron.db.db_base_plugin_v2

Partial-Bug: #1668262
Change-Id: I205bac32d94bc40b737f7b2e90f559925821110a

noironetworks/neutron,openstack/neutron,mahak/neutron,huntxu/neutron,eayunstack/neutron,openstack/neutron,huntxu/neutron,openstack/neutron,eayunstack/neutron,noironetworks/neutron,mahak/neutron,mahak/neutron