Merge pull request #1 from simong/performance

Puppetized Cassandra startup.
Made sure the correct URLs are in the readme and provisioning files.
Merge branch 'master' of github.com:sakaiproject/puppet-hilary

* 'master' of github.com:sakaiproject/puppet-hilary:
  Removed curl command from opscenterd. Left a todo for cluster configuration
  Starting cassandra only when it's down or the config changed.
  Puppetized Cassandra startup. Puppetized opscenter-agent Clean scripts for app and db node. Use POSIX compliant silent grep
Added gnuplot too the tsung manifest
Added a subscribe command to the cassandra service for config changes
and chowning before running cassandra
Flushing redis when cleaning the appnode.
Added tenants to the nginx config.
Added a restore option to the cleandb script.
Only removing 'oae' keyspace
New db clean script
Added munin to the centos nodes
Use cluster instead of app.js
Adding clean-only script that just empties cassandra data.
Making dbclean.sh executable
Adding cassandra initial tokens. Giving more time for Cassandra to shut down.
Also make sure dbnode.sh gives time for cassandra to shut down.
Give more time for db servers to come down
Axe the java processes after 15s service shutdown grace.
Adding shutdown scripts for cassandra
Fixing Tsung version property