Support bucket versioning (#9377)

- Implement a new xl.json 2.0.0 format to support,
  this moves the entire marshaling logic to POSIX
  layer, top layer always consumes a common FileInfo
  construct which simplifies the metadata reads.
- Implement list object versions
- Migrate to siphash from crchash for new deployments
  for object placements.

Fixes #2111

cmd/object-api-datatypes.go

@@ -160,6 +160,17 @@ type ObjectInfo struct {
 	// Hex encoded unique entity tag of the object.
 	ETag string
 
+	// Version ID of this object.
+	VersionID string
+
+	// IsLatest indicates if this is the latest current version
+	// latest can be true for delete marker or a version.
+	IsLatest bool
+
+	// DeleteMarker indicates if the versionId corresponds
+	// to a delete marker on an object.
+	DeleteMarker bool
+
 	// A standard MIME type describing the format of the object.
 	ContentType string
 
@@ -317,6 +328,53 @@ type ListMultipartsInfo struct {
 	EncodingType string // Not supported yet.
 }
 
+// DeletedObjectInfo - container for list objects versions deleted objects.
+type DeletedObjectInfo struct {
+	// Name of the bucket.
+	Bucket string
+
+	// Name of the object.
+	Name string
+
+	// Date and time when the object was last modified.
+	ModTime time.Time
+
+	// Version ID of this object.
+	VersionID string
+
+	// Indicates the deleted marker is latest
+	IsLatest bool
+}
+
+// ListObjectVersionsInfo - container for list objects versions.
+type ListObjectVersionsInfo struct {
+	// Indicates whether the returned list objects response is truncated. A
+	// value of true indicates that the list was truncated. The list can be truncated
+	// if the number of objects exceeds the limit allowed or specified
+	// by max keys.
+	IsTruncated bool
+
+	// When response is truncated (the IsTruncated element value in the response is true),
+	// you can use the key name in this field as marker in the subsequent
+	// request to get next set of objects.
+	//
+	// NOTE: AWS S3 returns NextMarker only if you have delimiter request parameter specified,
+	//       MinIO always returns NextMarker.
+	NextMarker string
+
+	// NextVersionIDMarker may be set of IsTruncated is true
+	NextVersionIDMarker string
+
+	// List of objects info for this request.
+	Objects []ObjectInfo
+
+	// List of deleted objects for this request.
+	DeleteObjects []DeletedObjectInfo
+
+	// List of prefixes for this request.
+	Prefixes []string
+}
+
 // ListObjectsInfo - container for list objects.
 type ListObjectsInfo struct {
 	// Indicates whether the returned list objects response is truncated. A