[microsoft_dhcp] Fix incorrect log parsing for DHCP host.domain -> host.name (redo)

[nicpenning]

These are the tests and doc updates manually added.

Replaces the original PR that was botched due to CLA/credential mishap.
(#4280)

Closes #4279

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• Start Time: 2022-09-27T01:49:12.297+0000

• Duration: 15 min 25 sec

Test stats 🧪

Test	Results
Failed	0
Passed	6
Skipped	0
Total	6

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[efd6]

/test

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Package microsoft_dhcp 👍(0) 💚(0) 💔(1)

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Data stream	Previous EPS	New EPS	Diff (%)	Result
log	30303.03	22222.22	-8080.81 (-26.67%)	💔

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (1/1)	💚
Files	100.0% (3/3)	💚 2.582
Classes	100.0% (3/3)	💚 2.582
Methods	100.0% (21/21)	💚 10.061
Lines	99.205% (624/629)	👍 7.84
Conditionals	100.0% (0/0)	💚

[efd6]

LGTM. Thanks for your patience with this.

[nicpenning]

Awesome 👌🏻 And thank you for your patience putting up with me. I learned a lot and look forward contributing again in a much smoother manner.

Any idea on how long before this gets packaged up for use in Kibana?

[efd6]

It should be promoted probably next week.

[nicpenning]

Thank you.

[nicpenning]

Thank you.

[nicpenning]

I noticed that this is available for upgrade in the platform, however, the docs here (https://docs.elastic.co/en/integrations/microsoft_dhcp#changelog) are still not up to date. Will those come at a later time or did I miss something in the PR?