When setting a value for an operation input of complex type not all 'required' sub-properties are validated. Only 'required' sub-properties of scalar types and sub-properties with constraints are actually required

To reproduce:

• Add an interface operation to a VFC
• Add an input of complex type to interface operation with a scalar type or a type with a constraint and at least another sub-property where all sub-properties are required e.g tosca.datatypes.nfv.VirtualFileStorageData
• Add the VFC to a service
• Set the scalar or constraint sub-property to a valid value
• No error is thrown even though not all 'required' sub-properties were set