Missing tunnel_types parameter causes openvswitch plugin not start

[Tom Ellis]

Whilst debugging the module for why my openvswitch plugin is not running I saw this in the logs:
2014-02-07 13:50:45.310 4397 ERROR neutron.plugins.openvswitch.agent.ovs_neutron_agent [-] (u'Invalid tunnel type specificed: %s', '') Agent terminated!

I notice that in /etc/neutron/plugins/openvswitch/ovs_neutron_plugin.ini under the OVS section, tunnel_type gets set eg.:

[OVS]
tunnel_type=gre

However, in addition to this tunnel_types in the main section of the config gets set to "tunnel_types = " not "tunnel_types = gre" like the option under [OVS].

The comment in ovs_neutron_plugin.ini states:
# When running the agent with the OVS
# plugin, this value must be the same as "tunnel_type" in the "[ovs]" section.

Setting this parameter causes openvswitch plugin to load correctly.