Add cinder support

* using the new functional pattern: cinder_XXX functions are in
  lib/cinder
* enable with 'c-api,c-sch,c-vol' in ENABLED_SERVICES, n-vol is still the default
* exercises/volumes.sh runs for cinder and n-vol
* move config to /etc/cinder
* change volume_group to stack-volumes; this also renames the backing file
  to /opt/stack/data/stack-volumes-backing-file.
* removes osapi_volume from nova.conf enabled_apis
* integrates cinder + keystone
* launches c-sch
* tweaks for multi node
* move enabled_apis substitution to init_cinder

18Jun2010
* restored & rebased
* update setup.py to use setup_develop() in lib/cinder

Change-Id: I1e1aa4387031c56e4fa239eb73bea2af8cef0e38
diff --git a/unstack.sh b/unstack.sh
index 341270d..879f842 100755
--- a/unstack.sh
+++ b/unstack.sh
@@ -44,7 +44,7 @@
 fi
 
 # Get the iSCSI volumes
-if is_service_enabled n-vol; then
+if is_service_enabled cinder n-vol; then
     TARGETS=$(sudo tgtadm --op show --mode target)
     if [[ -n "$TARGETS" ]]; then
         # FIXME(dtroyer): this could very well require more here to