Munin monitoring with special plugins for:
 * Elasticsearch
 * Rabbitmq
 * Redis
 * Cassandra
Munin PR followup
Switching back to ipaddress for munin
IP address is only needed on the client.
Merge branch 'master' into hiera-munin

* master:
  Adding new etherpad config
  Adding application/javascript to gzipped types
  Adding monitor machine to staging environment
  Fix memlock ulimit type
  Adding limits class to abstract sysctl + ulimits
  Fixing sudoers for security update
  Fixing sudoers for security update
Using nodetool for user stats.
Setting CASSANDRA_CONF in nodetool script.
Using include ::munin::master rather than a class resource.
Merge remote-tracking branch 'simong/hiera-munin'