Default to OAS-compliant handling of additionalProperties #176

Job	Run time
Build .Net projects (samples/client/petstore/csharp/generichost/net4.7/AnyOf)	2m 15s
Build .Net projects (samples/client/petstore/csharp/generichost/net4.7/AnyOfNoCompare)	2m 11s
Build .Net projects (samples/client/petstore/csharp/generichost/net4.7/Petstore)	1m 16s
Build .Net projects (samples/client/petstore/csharp/generichost/net4.8/AnyOf)	2m 12s
Build .Net projects (samples/client/petstore/csharp/generichost/net4.7/UseDateTimeForDate)	2m 1s
Build .Net projects (samples/client/petstore/csharp/generichost/net4.7/FormModels)	2m 31s
Build .Net projects (samples/client/petstore/csharp/generichost/net4.8/AllOf)	1m 6s
Build .Net projects (samples/client/petstore/csharp/generichost/net4.7/OneOf)	2m 42s
Build .Net projects (samples/client/petstore/csharp/generichost/net4.8/FormModels)	2m 36s
Build .Net projects (samples/client/petstore/csharp/generichost/net4.7/AllOf)	1m 17s
Build .Net projects (samples/client/petstore/csharp/generichost/net4.8/Petstore)	2m 19s
Build .Net projects (samples/client/petstore/csharp/generichost/net4.8/AnyOfNoCompare)	1m 36s
Build .Net projects (samples/client/petstore/csharp/generichost/net4.8/UseDateTimeForDate)	59s
Build .Net projects (samples/client/petstore/csharp/generichost/net4.8/OneOf)	2m 20s
	27m 21s

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