Using CCM (Cassandra Cluster Manager) to create a mutli-node Cassandra cluster

CCM is great for a Developer creating a "Quick and Dirty" test cluster, 
do NOT use it for production clusters


Steps)

1) Install a Java JDK and set the environment vairable JAVA_HOME

2) Install Python and the Python cql and pyYAML modules

3) Make a directory to hold the ccm managed Cassandra instances
    mkdir ccm-manged

4) Have ccm download Cassandra, and start a 3 node cluster
     ccm create --version 4.0.1 --nodes 3 --start test_cluster

	CCM will download the specified version of cassandra to 
	~/.ccm/repository/. It will customize three .yaml files and 
	specify separate data directories and log file locations. 
	Data for each node will be stored in ~/.ccm/<cluster_name>/<node>/. 
	By default the interfaces for the nodes are 127.0.0.1, 127.0.0.2, etc...

5) ccm has a number of commands, they fall into 2 groups
    ccm <cluster command>
    ccm <node_id> <node command>

6) ccm stop -> will stop the cluster
   ccm status -> will show the cluster status
   ccm node1 ring -> will show the ring status for node1 
