WaitForAttach refactoring for iSCSI attacher/detacher

This change is prerequisite for implementing iSCSI attacher
and detacher.

In order to use chap authentication at iSCSI plugin after
implementing attacher and detacher, secret is needed at
AttachDisk() which is called from WaitForAttach().
To obtain secret, pod information is required, but
WaitForAttach() doesn't pass pod information inside.

This patch adds 'pod' as an argument of WaitForAttach()
and adds changes to drivers who implements WaitForAttach().

Fixes #48953

Author: mtanino

pkg/volume/cinder/attacher.go

@@ -24,6 +24,7 @@ import (
 	"time"
 
 	"github.com/golang/glog"
+	"k8s.io/api/core/v1"
 	"k8s.io/apimachinery/pkg/types"
 	"k8s.io/apimachinery/pkg/util/wait"
 	"k8s.io/kubernetes/pkg/cloudprovider"
@@ -220,7 +221,7 @@ func (attacher *cinderDiskAttacher) VolumesAreAttached(specs []*volume.Spec, nod
 	return volumesAttachedCheck, nil
 }
 
-func (attacher *cinderDiskAttacher) WaitForAttach(spec *volume.Spec, devicePath string, timeout time.Duration) (string, error) {
+func (attacher *cinderDiskAttacher) WaitForAttach(spec *volume.Spec, devicePath string, _ *v1.Pod, timeout time.Duration) (string, error) {
 	// NOTE: devicePath is is path as reported by Cinder, which may be incorrect and should not be used. See Issue #33128
 	volumeSource, _, err := getVolumeSource(spec)
 	if err != nil {