ApiXmlAdjuster doesn't remove nested types

[jpobst]

Given a type that ApiXmlAdjuster cannot resolve, it will remove the type from the output. However, because the collection of types is flattened, it will not remove types that are nested in that type.

When generator reads this collection back in, it will output:

Could not find top ancestor type 'my.package.MyClass' for nested type 'my.package.MyClass.MyNestedClass'

because the parent type is no long present.