Puppet: overcloud controller config

This patch provides an alternate implementation of
the OS::TripleO::Controller::SoftwareConfig which uses Puppet
to drive the configuration. Using this it is possible
to create a fully functional overcloud controller instance
which has the controller node configured via Puppet
stackforge modules. Initially this includes only the
following services:

  MySQL
  RabbitMQ
  Keepalived/HAProxy (HA is not yet fully supported however)
  Nova
  Neutron
  Keystone
  Glance (file backend)
  Cinder

Using these services it is possible to run devtest_overcloud.sh
to completion. The idea is that we can quickly add more
services once we have CI in place.

In order to test this you'll want to build your images
with these elements:

   os-net-config
   heat-config-puppet
   puppet-modules
   hiera

None of the OpenStack specific TripleO elements
should be used with this approach (the nova/neutron
elements were NOT used to build the controller image).

Also, rather than use neutron-openvswitch-agent to configure
low level networking it is recommended that os-net-config
by configured directly via heat modeling rather than
parameter passing to init-neutron-ovs. This allows us to
configure the physical network while avoiding the coupling to
the neutron-openvswitch-element that our standard
parameter driven networking currently uses. (We still need
to move init-neutron-ovs so that it isn't coupled and/or deprecate
its use entirely because the heat drive stuff is more flexible.)

Packages may optionally be pre-installed via DIB using the
-p option (-p openstack-neutron,openstack-nova) etc.

Change-Id: If8462e4eacb08eced61a8b03fd7c3c4257e0b5b8

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