Add tests for uuid in oneOf/anyOf (java okhttp-gson) #1030

Job	Run time
Build sbt/Scala client, servers (samples/client/petstore/java/okhttp-gson)	55s
Build sbt/Scala client, servers (samples/server/petstore/scala-play-server)	4m 55s
Build sbt/Scala client, servers (samples/server/petstore/scala-http4s-server)	54s
Build sbt/Scala client, servers (samples/client/petstore/scala-pekko)	55s
Build sbt/Scala client, servers (samples/server/petstore/scala-akka-http-server)	55s
Build sbt/Scala client, servers (samples/server/petstore/scala-pekko-http-server)	54s
Build sbt/Scala client, servers (samples/client/petstore/scala-http4s)	55s
Build sbt/Scala client, servers (samples/server/petstore/scala-cask)	1m 31s
Build sbt/Scala client, servers (samples/client/petstore/scalaz)	58s
Build sbt/Scala client, servers (samples/server/petstore/scala-lagom-server)	4m 15s
Build sbt/Scala client, servers (samples/server/petstore/scalatra)	3m 0s
	20m 7s

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