update coredns to v1.11.0

update coredns to v1.11.1
update coredns-kubeadm to 1.11.1
bump up corefile-migration to v1.0.21 based on https://github.com/coredns/corefile-migration/releases/tag/v1.0.21
fix dns_test ut failure

Signed-off-by: guangli.bao <guangli.bao@daocloud.io>

vendor/github.com/coredns/corefile-migration/migration/plugins.go

@@ -309,6 +309,17 @@ var plugins = map[string]map[string]plugin{
 				"ttl":         {}, // new option
 			},
 		},
+		"v3": plugin{
+			namedOptions: map[string]option{
+				"type":        {},
+				"class":       {},
+				"name":        {},
+				"answer name": {},
+				"edns0":       {},
+				"ttl":         {}, 
+				"cname_target": {}, // new option
+			},
+		},
 	},
 
 	"log": {
@@ -335,6 +346,15 @@ var plugins = map[string]map[string]plugin{
 				"serve_stale": {}, // new option
 			},
 		},
+		"v3": plugin{
+			namedOptions: map[string]option{
+				"success":     {},
+				"denial":      {},
+				"prefetch":    {},
+				"serve_stale": {}, 
+				"keepttl":     {}, // new option
+			},
+		},
 	},
 
 	"forward": {
@@ -406,6 +426,13 @@ var plugins = map[string]map[string]plugin{
 				"ttl":  {},
 			},
 		},
+		"v2": plugin{
+			namedOptions: map[string]option{
+				"apex": {},
+				"ttl":  {},
+				"fallthrough": {}, // new option
+			},
+		},
 	},
 
 	"proxy": {

vendor/github.com/coredns/corefile-migration/migration/versions.go

@@ -30,10 +30,22 @@ type release struct {
 
 // Versions holds a map of plugin/option migrations per CoreDNS release (since 1.1.4)
 var Versions = map[string]release{
+	"1.11.1": {
+		priorVersion:   "1.11.0",
+		dockerImageSHA: "1eeb4c7316bacb1d4c8ead65571cd92dd21e27359f0d4917f1a5822a73b75db1",
+		plugins: 		plugins_1_11_0,
+	},
+	"1.11.0": {
+		nextVersion:    "1.11.1",
+		priorVersion:   "1.10.1",
+		dockerImageSHA: "cc3ebb05fbdba439d2d69813f162aa204b027098c8244fb3156e6e7c0f31c548",
+		plugins: 		plugins_1_11_0,
+	},
 	"1.10.1": {
+		nextVersion:    "1.11.0",
 		priorVersion:   "1.10.0",
 		dockerImageSHA: "a0ead06651cf580044aeb0a0feba63591858fb2e43ade8c9dea45a6a89ae7e5e",
-		plugins:        plugins_1_9_3,
+		plugins:        plugins_1_10_1,
 	},
 	"1.10.0": {
 		nextVersion:    "1.10.1",
@@ -745,6 +757,44 @@ var Versions = map[string]release{
 }`},
 }
 
+var plugins_1_11_0 = map[string]plugin{
+	"errors":       plugins["errors"]["v3"],
+	"log":          plugins["log"]["v1"],
+	"health":       plugins["health"]["v1"],
+	"ready":        {},
+	"autopath":     {},
+	"kubernetes":   plugins["kubernetes"]["v8"],
+	"k8s_external": plugins["k8s_external"]["v2"], //add fallthrough option
+	"prometheus":   {},
+	"forward":      plugins["forward"]["v3"],
+	"cache":        plugins["cache"]["v2"],
+	"loop":         {},
+	"reload":       {},
+	"loadbalance":  {},
+	"hosts":        plugins["hosts"]["v1"],
+	"rewrite":      plugins["rewrite"]["v3"], // add cname_target option
+	"transfer":     plugins["transfer"]["v1"],
+}
+
+var plugins_1_10_1 = map[string]plugin{
+	"errors":       plugins["errors"]["v3"],
+	"log":          plugins["log"]["v1"],
+	"health":       plugins["health"]["v1"],
+	"ready":        {},
+	"autopath":     {},
+	"kubernetes":   plugins["kubernetes"]["v8"],
+	"k8s_external": plugins["k8s_external"]["v1"],
+	"prometheus":   {},
+	"forward":      plugins["forward"]["v3"],
+	"cache":        plugins["cache"]["v2"], // add keepttl option
+	"loop":         {},
+	"reload":       {},
+	"loadbalance":  {},
+	"hosts":        plugins["hosts"]["v1"],
+	"rewrite":      plugins["rewrite"]["v2"],
+	"transfer":     plugins["transfer"]["v1"],
+}
+
 var plugins_1_9_3 = map[string]plugin{
 	"errors":       plugins["errors"]["v3"], // stacktrace option added
 	"log":          plugins["log"]["v1"],