The ml2 db migration path doesn't create subnetroutes table. Therefore
installations were partially relying on automatic schema generation.
This patch fixes the migration path.
Change-Id: I3060dd9538b629ad7277af28008ddde27926dcc4
Closes-Bug: #
1290255
'neutron.plugins.openvswitch.ovs_neutron_plugin.OVSNeutronPluginV2',
'neutron.plugins.linuxbridge.lb_neutron_plugin.LinuxBridgePluginV2',
'neutron.plugins.metaplugin.meta_neutron_plugin.MetaPluginV2',
+ 'neutron.plugins.ml2.plugin.Ml2Plugin',
'neutron.plugins.nec.nec_plugin.NECPluginV2',
'neutron.plugins.nicira.NeutronPlugin.NvpPluginV2',
'neutron.plugins.nicira.NeutronServicePlugin.NvpAdvancedPlugin',