Add support for client_dns_lookup setting

[ajoliveira]

• Add client_dns_lookup setting to both input and output plugins
• Update documentation to reflect setting options

[kares]

Thanks Angelo, looking good!

Would consider to makes the supported values enumerated, just to catch typos earlier, wdyt?
(:validate => ["default", "use_all_dns_ips", "resolve_canonical_bootstrap_servers_only"])

Also if you could please bump the version to 10.2.0 and add a CHANGELOG entry for the target version, and link this PR there, it would be could to release right after its merged.

[ajoliveira]

Thanks for noting that. Let me know if anything else is required.

[roaksoax]

@ajoliveira It seems this branch has conflicts. Any chance you could address those ?

[roaksoax]

@kares Since you are the original reviewer, could you please take a look again?

[kares]

👍