Fix mount refactor nits

pkg/util/mount/fake.go

@@ -18,7 +18,7 @@ package mount
 
 // FakeMounter implements mount.Interface.
 type FakeMounter struct {
-	mountPoints []MountPoint
+	MountPoints []MountPoint
 }
 
 func (f *FakeMounter) Mount(source string, target string, fstype string, flags uintptr, data string) error {
@@ -30,5 +30,5 @@ func (f *FakeMounter) Unmount(target string, flags int) error {
 }
 
 func (f *FakeMounter) List() ([]MountPoint, error) {
-	return f.mountPoints, nil
+	return f.MountPoints, nil
 }

pkg/util/mount/mount.go

@@ -51,7 +51,7 @@ type MountPoint struct {
 }
 
 // Examines /proc/mounts to find all other references to the device referenced
-// by mountPath.
+// by mountPath; returns a list of paths.
 func GetMountRefs(mounter Interface, mountPath string) ([]string, error) {
 	mps, err := mounter.List()
 	if err != nil {