Merge pull request #431 from blueboxgroup/db-remove-anonymous-mysql-users

db: remove anonymous MySQL users to fix authentication
Remove the 2-stage sensu repo addition

Because this was a 2-stage repo add, the apt cache would not be updated
because it almost certainly has been < 3600 seconds. Now that this
upstream bug is addressed, use the ansible module to add the repo.
Merge pull request #434 from craigtracey/cifix

Remove the 2-stage sensu repo addition
Remove apt_cache for now

apt_cache is somehow breaking the CI runs when attempting to install
the sensu packages.
Merge pull request #436 from craigtracey/fixci2

Remove apt_cache for now
Use Neutron ML2 plugin
Configurable Neutron core plugin
Gaurd VXLAN tunnel config
Fail neutron-common task on invalid plugin
Update Horizon to stable/icehouse
Add back python-memcached requirement
Hide external networks from launch instance workflow
Hide Neutron LBaaS in Horizon
Use github as a git mirror
Upgrade Neutron to icehouse
Update python-novaclient and python-neutronclient to meet neutron icehouse requirements
Disable LBaaS by defualt
neutron: update api-paste.ini
Remove duplicate LBaaS service plugin
Neutron: tune agent reporing, and fix warnings