Update to elastic/beats@794ed81680a9

[simitt]

Motivation/summary

Update beats to pull in changes made to docker image ownership and ensure the changes do not break anything.

cc @jsoriano and @barkbay

Checklist

- [ ] I have signed the Contributor License Agreement.
- [ ] I have updated CHANGELOG.asciidoc

I have considered changes for:
- [ ] documentation
- [ ] logging (add log lines, choose appropriate log selector, etc.)
- [ ] metrics and monitoring (create issue for Kibana team to add metrics to visualizations, e.g. Kibana#44001)

• automated tests (add tests for the code changes, all unit tests pass locally)
  - [ ] telemetry
  - [ ] Elasticsearch Service (https://cloud.elastic.co)
  - [ ] Elastic Cloud Enterprise (https://www.elastic.co/products/ece)
  - [ ] Elastic Cloud on Kubernetes (https://www.elastic.co/elastic-cloud-kubernetes)

How to test these changes

Related issues

related elastic/beats#18873

[apmmachine]

💚 Build Succeeded

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Build stats

• Build Cause: [Pull request #3941 opened]

• Start Time: 2020-07-02T12:32:39.261+0000

• Duration: 52 min 8 sec

Test stats 🧪

Test	Results
Failed	0
Passed	3217
Skipped	147
Total	3364

Steps errors

Expand to view the steps failures

• Name: Compress

  • Description: tar --exclude=coverage-files.tgz -czf coverage-files.tgz coverage

  • Duration: 0 min 0 sec

  • Start Time: 2020-07-02T12:50:14.188+0000

  • log

• Name: Compress

  • Description: tar --exclude=system-tests-linux-files.tgz -czf system-tests-linux-files.tgz system-tests

  • Duration: 0 min 0 sec

  • Start Time: 2020-07-02T13:02:21.951+0000

  • log

• Name: Test Sync

  • Description: ./script/jenkins/sync.sh

  • Duration: 3 min 36 sec

  • Start Time: 2020-07-02T12:45:14.410+0000

  • log