Support bucket versioning (#9377)

- Implement a new xl.json 2.0.0 format to support,
  this moves the entire marshaling logic to POSIX
  layer, top layer always consumes a common FileInfo
  construct which simplifies the metadata reads.
- Implement list object versions
- Migrate to siphash from crchash for new deployments
  for object placements.

Fixes #2111

cmd/generic-handlers_test.go

@@ -199,12 +199,16 @@ var containsReservedMetadataTests = []struct {
 }
 
 func TestContainsReservedMetadata(t *testing.T) {
-	for i, test := range containsReservedMetadataTests {
-		if contains := containsReservedMetadata(test.header); contains && !test.shouldFail {
-			t.Errorf("Test %d: contains reserved header but should not fail", i)
-		} else if !contains && test.shouldFail {
-			t.Errorf("Test %d: does not contain reserved header but failed", i)
-		}
+	for _, test := range containsReservedMetadataTests {
+		test := test
+		t.Run("", func(t *testing.T) {
+			contains := containsReservedMetadata(test.header)
+			if contains && !test.shouldFail {
+				t.Errorf("contains reserved header but should not fail")
+			} else if !contains && test.shouldFail {
+				t.Errorf("does not contain reserved header but failed")
+			}
+		})
 	}
 }