Puppet: overcloud compute config

Puppet: overcloud compute config

This patch provides an alternate implementation of
the OS::TripleO::Compute::SoftwareConfig which uses Puppet
to drive the configuration. Using this it is possible
to create a fully functional overcloud compute instance
which has the compute node configured via Puppet
stackforge modules.  This includes all the Nova, Neutron,
and Ceilometer configuration required to make things work.

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/ceilometer
elements were NOT used to build the compute 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).

Change-Id: Ic36be25d70f0a94ca07ffda6e0005669b81c1ac7