kafka header not mirroring

[hgword]

Is your feature request related to a problem? Please describe.
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I try to Mirroring kafka clusters.
and I using same as tutorial.
but brooklin miss mirroring that kafka headers.

Describe the solution you'd like
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kafka header also mirroring it.

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I checked "KafkaMirrorMakerConnectorTask.java".
I think add kafka header copy logic in translate method.

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