Disable reverse DNS lookup for RegionServers

[siegfriedweber]

Description

Default hbase.unsafe.regionserver.hostname.disable.master.reversedns to true, to ensure the names of RegionServers are resolved to their hostnames instead of IP addresses.

If desired, this option can be reset to false in configOverrides at the rolegroup level, but not at the role level (see stackabletech/operator-rs#339).

Closes #405

Definition of Done Checklist

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Author

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1. Changes are OpenShift compatible
2. Helm chart can be installed and deployed operator works
3. Integration tests passed (for non trivial changes)
4. Changes need to be "offline" compatible

Reviewer

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1. Code contains useful comments
2. (Integration-)Test cases added
3. Documentation added or updated
4. Changelog updated
5. Cargo.toml only contains references to git tags (not specific commits or branches)

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1. Feature Tracker has been updated
2. Proper release label has been added

[siegfriedweber]

https://ci.stackable.tech/view/02%20Operator%20Tests%20(custom)/job/hbase-operator-it-custom/118/

[sbernauer]

This worked fine in our tests and resolved the problems