691932bba6
As cassandra start script hardcodes the location of logback configuration to `CASSANDRA_CONF_DIR/logback.xml` there is no way to pass an alternate file via `$JVM_OPTS` for example. Also, without logback configuration DEBUG level is used which is not necessary for standard usage. With this commit a default logback configuration is set with log level INFO. Configuration borrowed from: https://docs.datastax.com/en/cassandra/3.0/cassandra/configuration/configLoggingLevels.html
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