[IPtables] Sync IPtables package with Filebeat module

[legoguy1000]

What does this PR do?

Syncs the integration with the Filebeat module

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.
• If I'm introducing a new feature, I have modified the Kibana version constraint in my package's manifest.yml file to point to the latest Elastic stack release (e.g. ^7.13.0).

Author's Checklist

• [ ]

How to test this PR locally

cd integrations/packages/iptables
elastic-package build && elastic-package stack up -d --services=elasticsearch && $(elastic-package stack shellinit) && elastic-package test pipeline --data-streams log

Related issues

• Related [Meta] 7.14 Planned changes to all packages #994

Screenshots

[elasticmachine]

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Build stats

• Build Cause: P1llus commented: run tests

• Start Time: 2021-06-16T07:27:32.468+0000

• Duration: 16 min 3 sec

• Commit: 0fbdf5a

Test stats 🧪

Test	Results
Failed	0
Passed	26
Skipped	0
Total	26

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[P1llus]

LGTM

[P1llus]

run tests