cassandra: Refactor the former installation scripts

• Move the previous yaml base configuration to a puppet template
• Install cassandra via the archive instead of the debian packages It gives more flexibilities regarding the multi instances configuration
• Support multi instance per server
• Make the cassandra.yaml content less verbose

There is still some work to do:

• Manage more cassandra configuration properties
• Add the tcp port monitoring
• Wire the exporter metrics to one of the prometheus

Related to T4373