Pre-flight check and yaml_diff tools

The pre-flight check tool is available for packaged installations. This collection of tests can be run on a node to detect and fix a configuration. The yaml_diff tool filters differences between cassandra.yaml files.

The pre-flight check tool, located in /usr/share/dse/tools of packaged installations, is a collection of tests that can be run on a node to detect and fix a configuration. The tool can detect and fix many invalid or suboptimal configuration settings. The tool is not available in tarball installations.

This release includes the yaml_diff tool that filters differences between two cassandra.yaml files, which is useful during upgrades. The new tool is located in the tools directory.

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