cleanup: reduce struct padding

internal/rbd/rbd_util.go:89:15: struct of size 312 bytes could be of
size 304 bytes:
``
struct{
	RbdImageName   	string,
	ImageID        	string,
	VolID          	string,
	Monitors       	string,
	JournalPool    	string,
	Pool           	string,
	RadosNamespace 	string,
	ClusterID      	string,
	RequestName    	string,
	NamePrefix     	string,
	ParentName     	string,
	ParentPool     	string,
	ClusterName    	string,
	Owner          	string,
	VolSize        	int64,
	StripeCount    	uint64,
	StripeUnit     	uint64,
	ObjectSize     	uint64,
	ImageFeatureSet	github.com/ceph/go-ceph/rbd.FeatureSet,
	encryption
*github.com/ceph/ceph-csi/internal/util.VolumeEncryption,
	CreatedAt
*google.golang.org/protobuf/types/known/timestamppb.Timestamp,
	conn
*github.com/ceph/ceph-csi/internal/util.ClusterConnection,
	ioctx          	*github.com/ceph/go-ceph/rados.IOContext,
	Primary        	bool,
	EnableMetadata 	bool,
}
`` (maligned)
type rbdImage struct {
              ^}`
make: *** [Makefile:118: go-lint] Error 1

Signed-off-by: Prasanna Kumar Kalever <[email protected]>

internal/rbd/rbd_util.go

@@ -95,16 +95,7 @@ type rbdImage struct {
 	ImageID string
 	// VolID is the volume ID that is exchanged with CSI drivers,
 	// identifying this rbd image
-	VolID string `json:"volID"`
-
-	// VolSize is the size of the RBD image backing this rbdImage.
-	VolSize int64
-
-	// image striping configurations.
-	StripeCount uint64
-	StripeUnit  uint64
-	ObjectSize  uint64
-
+	VolID    string `json:"volID"`
 	Monitors string
 	// JournalPool is the ceph pool in which the CSI Journal/CSI snapshot Journal is
 	// stored
@@ -121,31 +112,36 @@ type rbdImage struct {
 	// config maps in v1.0.0
 	RequestName string
 	NamePrefix  string
-
 	// ParentName represents the parent image name of the image.
 	ParentName string
 	// Parent Pool is the pool that contains the parent image.
-	ParentPool      string
-	ImageFeatureSet librbd.FeatureSet
-	// Primary represent if the image is primary or not.
-	Primary bool
-
+	ParentPool string
 	// Cluster name
 	ClusterName string
-	// Set metadata on volume
-	EnableMetadata bool
-
-	// encryption provides access to optional VolumeEncryption functions
-	encryption *util.VolumeEncryption
 	// Owner is the creator (tenant, Kubernetes Namespace) of the volume
 	Owner string
 
-	CreatedAt *timestamp.Timestamp
+	// VolSize is the size of the RBD image backing this rbdImage.
+	VolSize int64
+
+	// image striping configurations.
+	StripeCount uint64
+	StripeUnit  uint64
+	ObjectSize  uint64
 
+	ImageFeatureSet librbd.FeatureSet
+	// encryption provides access to optional VolumeEncryption functions
+	encryption *util.VolumeEncryption
+	CreatedAt  *timestamp.Timestamp
 	// conn is a connection to the Ceph cluster obtained from a ConnPool
 	conn *util.ClusterConnection
 	// an opened IOContext, call .openIoctx() before using
 	ioctx *rados.IOContext
+
+	// Primary represent if the image is primary or not.
+	Primary bool
+	// Set metadata on volume
+	EnableMetadata bool
 }
 
 // rbdVolume represents a CSI volume and its RBD image specifics.