Functional tests for enable passing status code from handlers to end user

[malaskowski]

Description

Functional tests for enable passing status code from handlers to end user

Motivation and Context

https://github.com/Knotx/knotx-fragments/issues/161

Upgrade notes

Location header was added to the default server allowedResponseHeaders configuration so that it will be passed together with redirect status codes.

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• [x] I have read the CONTRIBUTING document.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.

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