fortinet_fortigate: fix handling of events with from fields

[efd6]

Previously, the rename would attempt to redo work already done by the
append, causing a pipeline failure. So remove it.

What does this PR do?

This fixes handling of SIP events by removing a redundant rename processor.

Checklist

• 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.

Author's Checklist

• This abuses the ECS to place the SIP address in the email address field. I'm not entirely convinced this is a good idea, or that it is commonly done. Input welcome. A potential enhancement would be to properly handle the SIP address.

How to test this PR locally

Related issues

• Fixes Fortinet Integration Error #3897

Screenshots

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• Start Time: 2022-07-29T12:40:22.663+0000

• Duration: 18 min 6 sec

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Name	Metrics % (covered/total)	Diff
Packages	100.0% (1/1)	💚
Files	100.0% (4/4)	💚 2.868
Classes	100.0% (4/4)	💚 2.868
Methods	100.0% (38/38)	💚 10.749
Lines	92.003% (1070/1163)	👍 1.402
Conditionals	100.0% (0/0)	💚

[taylor-swanson]

LGTM

I originally made the changes for the append/email, but that rename appears to be an oversight on my part. It should've been removed, which is being done here.

Since fortinet has been split into separate packages, I take it we are deprecating the fortinet package and only maintaining this one from now on?

[efd6]

Since fortinet has been split into separate packages, I take it we are deprecating the fortinet package and only maintaining this one from now on?

That is my understanding.