Make BinaryMetadataWork Serializable

main 18:12:01,818 WARN  [TransactionImpl] Unexpected exception from afterCompletion; continuing
org.nuxeo.ecm.core.api.NuxeoException: Cannot serialize work of type org.nuxeo.binary.metadata.internals.BinaryMetadataWork
	at org.nuxeo.ecm.core.work.TestWorkQueuing$1.clone(TestWorkQueuing.java:44)
	at org.nuxeo.ecm.core.work.TestWorkQueuing$1.putElement(TestWorkQueuing.java:36)
	at org.nuxeo.ecm.core.work.NuxeoBlockingQueue.put(NuxeoBlockingQueue.java:107)
	at org.nuxeo.ecm.core.work.NuxeoBlockingQueue.offer(NuxeoBlockingQueue.java:90)
	at org.nuxeo.ecm.core.work.MemoryBlockingQueue.workSchedule(MemoryBlockingQueue.java:179)
	at org.nuxeo.ecm.core.work.MemoryWorkQueuing.workSchedule(MemoryWorkQueuing.java:65)
	at org.nuxeo.ecm.core.work.WorkManagerImpl.schedule(WorkManagerImpl.java:698)
	at org.nuxeo.ecm.core.work.WorkManagerImpl$WorkScheduling.afterCompletion(WorkManagerImpl.java:469)
	at org.apache.geronimo.transaction.manager.TransactionImpl.afterCompletion(TransactionImpl.java:540)
	at org.apache.geronimo.transaction.manager.TransactionImpl.afterCompletion(TransactionImpl.java:533)
	at org.apache.geronimo.transaction.manager.TransactionImpl.commit(TransactionImpl.java:329)
	at org.apache.geronimo.transaction.manager.TransactionManagerImpl.commit(TransactionManagerImpl.java:252)
	at org.nuxeo.runtime.jtajca.NuxeoContainer$UserTransactionImpl.commit(NuxeoContainer.java:535)
	at org.nuxeo.runtime.transaction.TransactionHelper.commitOrRollbackTransaction(TransactionHelper.java:359)
	at org.nuxeo.ecm.core.test.TransactionalFeature.nextTransaction(TransactionalFeature.java:74)
	at org.nuxeo.ecm.core.test.TransactionalFeature.nextTransaction(TransactionalFeature.java:64)
	at org.nuxeo.binary.metadata.test.TestBinaryMetadataAsyncListener.testListener(TestBinaryMetadataAsyncListener.java:80)
Caused by: org.apache.commons.lang3.SerializationException: java.io.NotSerializableException: org.nuxeo.binary.metadata.internals.MetadataMappingDescriptor
	at org.apache.commons.lang3.SerializationUtils.serialize(SerializationUtils.java:157)
	at org.apache.commons.lang3.SerializationUtils.serialize(SerializationUtils.java:179)
	at org.apache.commons.lang3.SerializationUtils.clone(SerializationUtils.java:82)
	at org.nuxeo.ecm.core.work.TestWorkQueuing$1.clone(TestWorkQueuing.java:42)
	... 63 more
Caused by: java.io.NotSerializableException: org.nuxeo.binary.metadata.internals.MetadataMappingDescriptor
	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1184)
	...
	at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:348)
	at org.apache.commons.lang3.SerializationUtils.serialize(SerializationUtils.java:154)
	... 66 more