Error deploying a database XML file with CMA

[rjrudin]

Copied from #525 . Something in the set of Database Java classes isn't happy about that XML, need to figure out the issue and hopefully it's just a simple tweak to those classes so that the XML is unmarshalled correctly.

[rjrudin]

Turns out this is an issue in the Manage API - when multiple values exist for a localname, the JSON representation expects an array of strings, while the XML representation expects a single string. Will file a bug with ML.

In the meantime, the workaround is to not use CMA when deploying databases via XML files that have such elements in them.

[rjrudin]

Verified that this is still an issue with 11.2.0. There's a lot of complexity with maintaining a set of Java classes to allow for XML to be converted into JSON, and I'm thinking the best bet here is to say "Don't use XML files when using CMA" until we can fully support that. And we'll likely never support a mix of JSON/XML files when using CMA due to the complexity of trying to normalize those files to either JSON or XML.