Remove diskimage-builder core contents.

Change-Id: I5c7826432bc9d8c1743ab4e575bd3edd5ba4af78
Simplify recommended use of ELEMENTS_PATH.

Change-Id: If572fc2b598fe6606baa6e147e1a8e7c8460fd5f
Remove quantum-api element, for now.

quantum-api element is out of date.

While services will need to break up services soon,
in this case it should be done by depending on 'quantum'
element, and having quantum-api element just drop a
service-start script.

Change-Id: Idbcab2266c40aff0129d5bd4cfa1295571ec8165
Remove nova-vm element.

nova-vm element has become out of date with the
rest of the tripleo system.

It should be replaced by specifying libvirt to the
os-config-applier-able 'nova' element.

Change-Id: I147f5a536ca40f63b2c43b72ea2678c570516215
A self-contained one-node baremetal openstack.

The 'boot-stack' element is a self-contained, baremetal openstack.
Upon first boot, it will initialize itself with default keystone
users, nova flavors, etc.

Change-Id: Ib0c411627154a3d666f74513c6b8edfbfbf6c07e
Add OpenStack Heat elements.

Change-Id: I9c1c7920848c9e1e4d44270128d6ef41598b2833
Merge "Add OpenStack Heat elements."
Remove nova-api element.

nova-api has become out of date.

It should be replaced by depending on the 'nova' element,
and using os-svc-daemon to install a nova-api start script.

Change-Id: Ied84c385e80a702a61ae51d45765aa9e65f614d4
Remove openstack-all element.

openstack-all element is out of date, and has been
superceded by the boot-stack element.

Change-Id: I6c3a3c3302cec0d2e3c0eea354e1f80e922f9d5f