Add clean.sh

clean.sh gets rid of all residue of running DevStack except installed
packages and pip modules.

And it eradicates rabbitmq-server and ts erlang dependencies as well as
the other RPC backends and databases.

Change-Id: I2b9a251a0a151c012bae85a5a2f9c2f72e7700be
diff --git a/lib/glance b/lib/glance
index 9ec2112..edf6982 100644
--- a/lib/glance
+++ b/lib/glance
@@ -59,8 +59,7 @@
 function cleanup_glance() {
     # kill instances (nova)
     # delete image files (glance)
-    # This function intentionally left blank
-    :
+    sudo rm -rf $GLANCE_CACHE_DIR $GLANCE_IMAGE_DIR $GLANCE_AUTH_CACHE_DIR
 }
 
 # configure_glanceclient() - Set config files, create data dirs, etc