On ubuntu the neutron-metering-agent plugin needs to be specified in the packages.

Signed-off-by: JuanJose 'JJ' Galvez <jj.galvez@inktank.com>
Ubuntu the plugin name is neutron-plugin-metering-agent.
Fixes chef-client run failing on install and service
enablement/restart.

Signed-off-by: JuanJose 'JJ' Galvez <jj.galvez@inktank.com>
Two folders were missing causing the proposal for neutron to
fail when using the default values. These folders are:

* /etc/neutron/plugins/ml2/
* /var/cache/neutron/

Signed-off-by: JuanJose 'JJ' Galvez <jj.galvez@inktank.com>