Merge pull request #3903 from yue9944882/remove-json-gen-ignore

Branch(master-java8): Remove "JSON.java" from openapi gen ignore file

Author: k8s-ci-robot

kubernetes/.openapi-generator-ignore

@@ -5,6 +5,3 @@
 git_push.sh
 README.md
 pom.xml
-
-# Remove when changes in kubernetes-client/java#366,#240 make into upstream openapi-generator
-src/main/java/io/kubernetes/client/openapi/JSON.java