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.
Merge pull request #187 from cloudnull/neutron-juno

Juno Neutron updates