engine: Increase start and create timeouts

[samuelkarp]

Summary

Increases the timeout for start container to 3 minutes and create container to 4 minutes. Related to #682.

Testing

• Builds on Linux (make release)
• Builds on Windows (go build -out amazon-ecs-agent.exe ./agent)
• Unit tests on Linux (make test) pass
• Unit tests on Windows (go test -timeout=25s ./agent/...) pass
• Integration tests on Linux (make run-integ-tests) pass
• Integration tests on Windows (.\scripts\run-integ-tests.ps1) pass
• Functional tests on Linux (make run-functional-tests) pass
• Functional tests on Windows (.\scripts\run-functional-tests.ps1) pass

New tests cover the changes: no

Description for the changelog

Enhancement - Increase docker start and docker create timeouts to improve reliability under some workloads.

Licensing

This contribution is under the terms of the Apache 2.0 License: yes (Amazon employee)

[aaithal]

Wonder if we should increase it by a minute for create as well.

[samuelkarp]

@aaithal I don't have a strong opinion on that. Want me to bump that up too?

[aaithal]

Yeah, just because we know that creates are more expensive than starts in terms of time. How does 4 * time.Minute sound?

[samuelkarp]

@aaithal Done