[Rust] fix: add location prefix to prevent parameter name collisions #218

Job	Run time
Build .Net projects (samples/client/petstore/csharp/generichost/net4.7/AllOf)	1m 14s
Build .Net projects (samples/client/petstore/csharp/generichost/net4.7/AnyOfNoCompare)	1m 10s
Build .Net projects (samples/client/petstore/csharp/generichost/net4.7/OneOf)	1m 17s
Build .Net projects (samples/client/petstore/csharp/generichost/net4.7/FormModels)	1m 19s
Build .Net projects (samples/client/petstore/csharp/generichost/net4.8/OneOf)	1m 11s
Build .Net projects (samples/client/petstore/csharp/generichost/net4.8/FormModels)	1m 19s
Build .Net projects (samples/client/petstore/csharp/generichost/net4.8/UseDateTimeForDate)	1m 49s
Build .Net projects (samples/client/petstore/csharp/generichost/net4.8/AllOf)	1m 10s
Build .Net projects (samples/client/petstore/csharp/generichost/net4.7/Petstore)	1m 20s
Build .Net projects (samples/client/petstore/csharp/generichost/net4.8/AnyOfNoCompare)	1m 56s
Build .Net projects (samples/client/petstore/csharp/generichost/net4.8/AnyOf)	1m 12s
Build .Net projects (samples/client/petstore/csharp/generichost/net4.7/UseDateTimeForDate)	1m 15s
Build .Net projects (samples/client/petstore/csharp/generichost/net4.7/AnyOf)	1m 47s
Build .Net projects (samples/client/petstore/csharp/generichost/net4.8/Petstore)	1m 10s
	19m 9s

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