ApiGateway requires more meta data in OAS

[openBackhaul]

Problem:
The ApiGateway documentation requests for more comprehensive meta data in the OAS.
Example:

openapi: 3.0.0
info:
  title: ApplicationName
  description: Short description of the application
  contact:
    name: Max Mustermann
    email: max.mustermann@telefonica.com
  version: 1.0.0

Proposed Solution:
Instead of changing the OAS before publishing at the ApiGateway, the ApplicationPattern and its documentation shall be complemented in such a way the requested information is provided from beginning on.

The following files need to be updated:

• chapter "Metadata" in StructureOfOas
• Open API specification of ApplicationPattern

Changes could be immediately done and do not need to be coordinated with a new release of the ApplicationPattern.