fix caosdb-deploy#225

Summary

Fix for #225 (closed).

Focus

• Problem was a wrong implementation of getOwners (src/main/java/org/caosdb/server/permissions/EntityACL.java).
• On the go I also updated shiro (library for Role-Based Access Management) and simplified some of the Check* jobs.

Test Environment

New unit tests where added which test the buggy behavior. Please check failing tests with original implementation (go to dev, git checkout src/test, then make test).

Check List for the Author

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• All automated tests pass
• Reference related Issues
• Up-to-date CHANGELOG.md
• Annotations in code (Gitlab comments)
  • Intent of new code
  • Problems with old code
  • Why this implementation?

Check List for the Reviewer

• I understand the intent of this MR
• All automated tests pass
• Up-to-date CHANGELOG.md
• The test environment setup works and the intended behavior is reproducible in the test environment
• In-code documentation and comments are up-to-date.
• Check: Are there specifications? Are they satisfied?

For further good practices have a look at our review guidelines.