bugfix: list version is incorrect

list version is incorrect because sometimes
we replace the master with an incorrect last version
because inserts are sometimes swapped. Add a check
to be sure we always replace the master with a
smaller (thus more recent) version.

lib/storage/metadata/mongoclient/MongoClientInterface.js

@@ -335,7 +335,11 @@ class MongoClientInterface {
 
     /*
      * In this case we generate a versionId and
-     * sequentially create the object THEN update the master
+     * sequentially create the object THEN update the master.
+     *
+     * It is possible that 2 version creations are inverted
+     * in flight so we also check that we update a master only
+     * if the version in place is greater that the one we set.
      */
     putObjectVerCase1(c, bucketName, objName, objVal, params, log, cb) {
         const versionId = generateVersionId(this.replicationGroupId);
@@ -355,7 +359,10 @@ class MongoClientInterface {
         }, {
             updateOne: {
                 filter: {
-                    _id: objName,
+                    '_id': objName,
+                    'value.versionId': {
+                        $gt: versionId,
+                    },
                 },
                 update: {
                     _id: objName, value: objVal,