lint warnings in j.u.concurrent packages

/w/lthudson/hudson-data/jobs/jdk8-lt-jdk-build/workspace/jdk/src/share/classes/java/util/concurrent/ConcurrentHashMap.java:4719: warning: [serial] serializable class java.util.concurrent.ConcurrentHashMap.BulkTask has no definition of serialVersionUID
    abstract static class BulkTask<K,V,R> extends CountedCompleter<R> {
                    ^
/w/lthudson/hudson-data/jobs/jdk8-lt-jdk-build/workspace/jdk/src/share/classes/java/util/concurrent/CompletableFuture.java:423: warning: [serial] serializable class java.util.concurrent.CompletableFuture.Async has no definition of serialVersionUID
    abstract static class Async extends ForkJoinTask<Void>
                    ^
/w/lthudson/hudson-data/jobs/jdk8-lt-jdk-build/workspace/jdk/src/share/classes/java/util/concurrent/CompletableFuture.java:674: warning: [serial] serializable class java.util.concurrent.CompletableFuture.Completion has no definition of serialVersionUID
    abstract static class Completion extends AtomicInteger implements Runnable {

/w/lthudson/hudson-data/jobs/jdk8-lt-jdk-build/workspace/jdk/src/share/classes/java/util/concurrent/atomic/Striped64.java:46: warning: [serial] serializable class java.util.concurrent.atomic.Striped64 has no definition of serialVersionUID
abstract class Striped64 extends Number {