8.x stack: predefine agent policies

[mtojek]

Fixes: #655

[elasticmachine]

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• Reason: null

• Start Time: 2022-01-31T16:32:59.577+0000

• Duration: 30 min 7 sec

• Commit: 3536ffa

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Test	Results
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Passed	471
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Total	471

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[jsoriano]

Thanks!

[mtojek]

Error is unrelated, but we may need to chase it finally:

�[36melastic-agent_1              |�[0m {"log.level":"info","@timestamp":"2022-01-31T16:30:28.286Z","log.origin":{"file.name":"cmd/enroll_cmd.go","file.line":253},"message":"Elastic Agent might not be running; unable to trigger restart","ecs.version":"1.6.0"}
�[36melastic-agent_1              |�[0m Error: could not read configuration file /usr/share/elastic-agent/state/elastic-agent.yml: yaml: line 47: could not find expected ':'
�[36melastic-agent_1              |�[0m For help, please see our troubleshooting guide at https://www.elastic.co/guide/en/fleet/8.1/fleet-troubleshooting.html

[mtojek]

/test