neutron plugins : - dns in user_variables causes neutron to stop working

[DimGR]

Hello

In Ocata 15.1.0 setting - dns in the user_variables.yml for neutron will make the neutron service useless.

i wanted to enable dns in neutron for magnum and i set up - dns then rerun the neutron role. The neutron playbook will finish with no errors but nothing related to neutron will work. In horizon all networking tabs will give out an error saying options can not be retrieved and nova list will not work either.
From logs i saw these errors posted below
http://paste.openstack.org/show/619199/

i deleted - dns from uservariables.yml , re run the neutron role and everything is operational again .

this config will work

## Debug and Verbose options.
debug: false
neutron_plugin_base:
  - router
  - metering
  - neutron_lbaas.services.loadbalancer.plugin.LoadBalancerPluginv2

this config will NOT work

## Debug and Verbose options.
debug: false
neutron_plugin_base:
  - router
  - metering
  - neutron_lbaas.services.loadbalancer.plugin.LoadBalancerPluginv2
  - dns

[Jean-Philippe Evrard (jean-philippe-evrard)]

Updating to stable/ocata fixes it, so we can continue.