Add API_RATE_LIMIT support
Unset HOST_IP
fixes for upgrade-glance and upgrade-packages
Default RECLONE=no
Deal with no pip in prep-work
Remove essex keystone.conf.sample
Set DATA_DIR
Add state_path and instances_path to nova.conf
Merge branch 'nova-conf'
Rip out essex bits
Update install docs
Set up exercise controls
Change terms

* 'start', 'work' -> 'base'
* 'final', 'trunk' -> 'target'
Rework directory structure

Create top-level directories for each release and put devstack and
the project repos under that.  data is still a top-level as it
will be processed for the upgrade.
General cleanup:

* Move *_RUN_EXERCISES after localrc
* Fix images cache dirs
* Save cinder database