client, model serialized to JSON does not have discriminator property, in option "pass-discriminator-to-child-deserialization"

[weidongxu-microsoft]

See #2408

Current generated code seems get confused around

• JsonTypeId https://fasterxml.github.io/jackson-annotations/javadoc/2.9/com/fasterxml/jackson/annotation/JsonTypeId.html
• JsonTypeInfo.As.EXISTING_PROPERTY https://fasterxml.github.io/jackson-annotations/javadoc/2.9/com/fasterxml/jackson/annotation/JsonTypeInfo.As.html
• static var

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The serialization can work with either

• use JsonTypeInfo.As.PROPERTY

or

• remove the JsonTypeId and make discriminator a (standard JSON property) class variable (not static)