Remove aufs snapshotter (deprecated since v1.5)

Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>

diff/apply/apply_linux_test.go

@@ -39,41 +39,3 @@ func TestGetOverlayPath(t *testing.T) {
 		t.Fatalf("An error is expected")
 	}
 }
-
-func TestGetAufsPath(t *testing.T) {
-	for _, test := range []struct {
-		options   []string
-		expectErr bool
-	}{
-		{
-			options:   []string{"random:option", "br:/test/rw=rw:/test/ro=ro+wh"},
-			expectErr: false,
-		},
-		{
-			options:   []string{"random:option"},
-			expectErr: true,
-		},
-		{
-			options:   []string{"br:/test/ro=ro+wh"},
-			expectErr: true,
-		},
-	} {
-		path, parents, err := getAufsPath(test.options)
-		if test.expectErr {
-			if err == nil {
-				t.Fatalf("An error is expected")
-			}
-			continue
-		}
-		if err != nil {
-			t.Fatalf("Get aufs path failed: %v", err)
-		}
-		if path != "/test/rw" {
-			t.Fatalf("Unexpected rw dir: %q", path)
-		}
-		if len(parents) != 1 || parents[0] != "/test/ro" {
-			t.Fatalf("Unexpected parents: %v", parents)
-		}
-
-	}
-}