Remove test for nested file delete on S3

Nested files aren't supported on MinIO, and as our storage layout is
filesystem based, we don't actually use nest files in the code.

Remove the test so that we can support MinIO.

Signed-off-by: James Hewitt <james.hewitt@uk.ibm.com>

registry/storage/driver/s3-aws/s3_test.go

@@ -310,7 +310,6 @@ func TestDelete(t *testing.T) {
 	objs := []string{
 		"/file1",
 		"/file1-2",
-		"/file1/2",
 		"/folder1/file1",
 		"/folder2/file1",
 		"/folder3/file1",
@@ -322,15 +321,6 @@ func TestDelete(t *testing.T) {
 	}
 
 	tcs := []testCase{
-		{
-			// special case where a given path is a file and has subpaths
-			name:   "delete file1",
-			delete: "/file1",
-			expected: []string{
-				"/file1",
-				"/file1/2",
-			},
-		},
 		{
 			name:   "delete folder1",
 			delete: "/folder1",
@@ -374,16 +364,8 @@ func TestDelete(t *testing.T) {
 		},
 	}
 
-	// objects to skip auto-created test case
-	skipCase := map[string]bool{
-		// special case where deleting "/file1" also deletes "/file1/2" is tested explicitly
-		"/file1": true,
-	}
 	// create a test case for each file
 	for _, p := range objs {
-		if skipCase[p] {
-			continue
-		}
 		tcs = append(tcs, testCase{
 			name:     fmt.Sprintf("delete path:'%s'", p),
 			delete:   p,