Improve SecurityWarnings regarding superuser privileges

[AIexanderDicke]

Checklist

• I have checked the issues list
  for similar or identical feature requests.
• I have checked the pull requests list
  for existing proposed implementations of this feature.
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Related Issues and Possible Duplicates

Related Issues

• None

Possible Duplicates

• None

Brief Summary

If celery runs with a group not contained in the group database, the check_privileges-function will always give the warning SecurityWarning: You're running the worker with superuser privileges: this is absolutely not recommended! even when not running with superuser privileges. This warning can be quite missleading.

Design

Architectural Considerations

None

Proposed Behavior

Change or remove the warning message in this situation.

Proposed UI/UX

Diagrams

N/A

Alternatives

None