Allow MP OpenAPI server.xml info section to be set with server.xml (2.0+)

[Azquelt]

New server.xml element

<mpOpenAPI>​
  <info title=""​
    description=""​
    termsOfService=""​
    contactName=""​
    contactUrl=""​
    contactEmail=""​
    licenseName=""​
    licenseUrl=""​
    licenseIdentifier=""​
    summary=""​
    version=""​
  />​
</mpOpenAPI>​

If <info> is present

• The info section of the OpenAPI document is replaced with one generated from this config
• The mp.openapi.extensions.liberty.merged.info property is ignored

Note that info and version are required, in the OpenAPI spec - the document will not validate if they're not present and a warning will be logged. Not sure if we can indicate in the metatype that these attributes are "required" for the purposes of any UI that might be using it.

[Azquelt]

Tasks:

• [ ] Update the metatype, use ibm:beta on the new elements/attributes
• [ ] Have a component which receives the config, currently this is OpenAPIEndpointManager since we only have endpoint config, so some refactoring will be needed here
• [ ] Update OpenAPIUtils.getConfiguredInfo to consider the new config from server.xml
  • Ensure this processing is gated behind the beta flag
• [ ] Test that the new config is ignored unless the beta flag is set (to be removed when feature is done)
• [ ] Test that the info object can be set with server.xml
  • We have existing tests in MergeConfigTest which can be adapted
• [ ] Test that the MP config properties are ignored if the new server.xml element is used
• [ ] Test that changes to the server.xml config are reflected immediately