Expand etcd data test to n-3

Author: Jefftree

test/integration/etcd/data.go

@@ -35,6 +35,7 @@ import (
 // Tests aiming for full coverage of versions should test fixtures of all supported versions.
 func GetSupportedEmulatedVersions() []string {
 	return []string{
+		compatibility.DefaultKubeEffectiveVersionForTest().BinaryVersion().SubtractMinor(3).String(),
 		compatibility.DefaultKubeEffectiveVersionForTest().BinaryVersion().SubtractMinor(2).String(),
 		compatibility.DefaultKubeEffectiveVersionForTest().BinaryVersion().SubtractMinor(1).String(),
 		compatibility.DefaultKubeEffectiveVersionForTest().BinaryVersion().String(),