In /liveness, verify that Cassandra is still running #548
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…ed) by checking the PID file exists and the PID is still running
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If the state is STARTED, the liveness requires the PID file to exists and the PID that's in there to be running.
Modify Cassandra start parameters to create the pidfile to /tmp/cassandra.pid
Fix Dockerfile validation issues from lower case "as".
Losing liveness makes Kubernetes kill the container and we start getting Terminated statuses (to properly track if Cassandra didn't for example like configuration).