Make TokenProvider not contain state so subclassing actually works co… #298

Job	Run time
Build .Net Framework projects (samples/client/petstore/csharp/generichost/net4.7/AnyOf)	1m 13s
Build .Net Framework projects (samples/client/petstore/csharp/generichost/net4.7/AllOf)	1m 10s
Build .Net Framework projects (samples/client/petstore/csharp/generichost/net4.7/OneOf)	1m 20s
Build .Net Framework projects (samples/client/petstore/csharp/generichost/net4.8/OneOf)	1m 9s
Build .Net Framework projects (samples/client/petstore/csharp/generichost/net4.8/AllOf)	1m 15s
Build .Net Framework projects (samples/client/petstore/csharp/generichost/net4.8/Petstore)	2m 2s
Build .Net Framework projects (samples/client/petstore/csharp/generichost/net4.8/AnyOfNoCompare)	1m 20s
Build .Net Framework projects (samples/client/petstore/csharp/generichost/net4.7/UseDateTimeForDate)	1m 13s
Build .Net Framework projects (samples/client/petstore/csharp/generichost/net4.8/FormModels)	1m 20s
Build .Net Framework projects (samples/client/petstore/csharp/generichost/net4.8/AnyOf)	1m 1s
Build .Net Framework projects (samples/client/petstore/csharp/generichost/net4.7/FormModels)	2m 39s
Build .Net Framework projects (samples/client/petstore/csharp/generichost/net4.8/UseDateTimeForDate)	1m 8s
Build .Net Framework projects (samples/client/petstore/csharp/generichost/net4.7/Petstore)	1m 11s
Build .Net Framework projects (samples/client/petstore/csharp/generichost/net4.7/AnyOfNoCompare)	1m 48s
	19m 49s

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