Juno Neutron updates

Updated Neutron for the Juno release.
* Changes in config were made to allow for automatic HA failover of Neutron Routers. (input from Phill Hopkins)
* Removes the ATT L3 HA tool as this functionality is now baked into Neutron proper.
* Removed package and git vars from group_vars/neutron_all.yml and change the plays to use the values in repo_pacakge/neutron.yml
* removed redundant tasks in all neutron plays.