Merge pull request kubernetes#61738 from ianchakeres/osx-volume-ut-fix

Automatic merge from submit-queue (batch tested with PRs 61452, 61727, 61462, 61692, 61738). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Skip volume unit tests that don't work on osx.

**What this PR does / why we need it**:

`volume/fc` and `volume/rbd` unit tests fail on osx.

```
$ pwd
<snip>/gopath/src/k8s.io/kubernetes/pkg/volume/fc
$ go test
--- FAIL: Test_ConstructVolumeSpec (0.00s)
    fc_test.go:450: couldn't fetch mountrefs
    fc_test.go:469: failed to retrieve WWIDs
    fc_test.go:450: couldn't fetch mountrefs
    fc_test.go:469: failed to retrieve WWIDs
FAIL
exit status 1
FAIL    k8s.io/kubernetes/pkg/volume/fc    0.054s
<snip>
$ pwd
<snip>/gopath/src/k8s.io/kubernetes/pkg/volume/rbd
$ go test
--- FAIL: TestConstructVolumeSpec (0.00s)
	rbd_test.go:575: ConstructVolumeSpec failed: directory /var/folders/59/yc7_f4fd53nbyw868zqpk78cn7shx9/T/rbd_test144865306/pods/pod123/volumes/kubernetes.io~rbd/vol is not mounted
	rbd_test.go:575: ConstructVolumeSpec failed: directory /var/folders/59/yc7_f4fd53nbyw868zqpk78cn7shx9/T/rbd_test144865306/pods/pod123/volumes/kubernetes.io~rbd/vol is not mounted
FAIL
exit status 1
FAIL	k8s.io/kubernetes/pkg/volume/rbd	0.063s
```

**Which issue(s) this PR fixes** :
Fixes kubernetes#61569 and kubernetes#61571 

**Special notes for your reviewer**:

To see these unit test fail, you need to run `go test` on an osx machine.

**Release note**:
```release-note
NONE
```

Author: Kubernetes Submit Queue

pkg/volume/fc/fc_test.go

@@ -19,6 +19,7 @@ package fc
 import (
 	"fmt"
 	"os"
+	"runtime"
 	"strconv"
 	"strings"
 	"testing"
@@ -424,6 +425,9 @@ func Test_getWwnsLunWwidsError(t *testing.T) {
 }
 
 func Test_ConstructVolumeSpec(t *testing.T) {
+	if runtime.GOOS == "darwin" {
+		t.Skipf("Test_ConstructVolumeSpec is not supported on GOOS=%s", runtime.GOOS)
+	}
 	fm := &mount.FakeMounter{
 		MountPoints: []mount.MountPoint{
 			{Device: "/dev/sdb", Path: "/var/lib/kubelet/pods/some-pod/volumes/kubernetes.io~fc/fc-in-pod1"},

pkg/volume/rbd/rbd_test.go

@@ -21,6 +21,7 @@ import (
 	"os"
 	"path/filepath"
 	"reflect"
+	"runtime"
 	"strings"
 	"sync"
 	"testing"
@@ -532,6 +533,9 @@ func TestGetDeviceMountPath(t *testing.T) {
 
 // https://github.com/kubernetes/kubernetes/issues/57744
 func TestConstructVolumeSpec(t *testing.T) {
+	if runtime.GOOS == "darwin" {
+		t.Skipf("TestConstructVolumeSpec is not supported on GOOS=%s", runtime.GOOS)
+	}
 	tmpDir, err := utiltesting.MkTmpdir("rbd_test")
 	if err != nil {
 		t.Fatalf("error creating temp dir: %v", err)