[cylance] Format host.mac per ECS

[andrewkroh]

What does this PR do?

Format the host.mac field as per ECS (https://www.elastic.co/guide/en/ecs/current/ecs-client.html#field-client-mac).

The notation format from RFC 7042 is suggested: Each octet (that is, 8-bit byte) is represented by two [uppercase] hexadecimal digits giving the value of the octet as an unsigned integer. Successive octets are separated by a hyphen.

The value also needed to be converted to an array.

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• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have verified that all data streams collect metrics or logs.
• I have added an entry to my package's changelog.yml file.
• I have verified that Kibana version constraints are current according to guidelines.

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Pinging @elastic/security-external-integrations (Team:Security-External Integrations)

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• Start Time: 2022-05-18T13:22:27.382+0000

• Duration: 16 min 13 sec

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Name	Metrics % (covered/total)	Diff
Packages	100.0% (1/1)	💚
Files	100.0% (1/1)	💚 3.589
Classes	100.0% (1/1)	💚 3.589
Methods	91.667% (11/12)	👍 3.378
Lines	92.857% (65/70)	👍 3.84
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[efd6]

Mod comment.

[efd6]

Should this be changed as well?

[andrewkroh]

That's a good point. It would probably be best to change this rsa.eth_host field and all other MACs in the rsa.* namespace at once so the format is consistent for that field.

I opened adriansr/nwdevice2filebeat#21 which would make the changes I did for the ECS fields obsolete, but I expect we'll replace all of the rsa2elk integrations before we modify the generator and update all of the generated integrations again.