IPv6: Set localhost and wildcard constants

Use IPv6 values for these. Requires updates of numerous golden files
and to upstream, this needs to be configurable, based on the IP mode
desired by the user.

pilot/pkg/proxy/envoy/v1/resources.go

@@ -106,10 +106,10 @@ const (
 	RedisDefaultOpTimeout = 30 * time.Second
 
 	// WildcardAddress binds to all IP addresses
-	WildcardAddress = "0.0.0.0"
+	WildcardAddress = "[::]"
 
 	// LocalhostAddress for local binding
-	LocalhostAddress = "127.0.0.1"
+	LocalhostAddress = "[::1]"
 
 	// EgressTraceOperation denotes the name of trace operation for Envoy
 	EgressTraceOperation = "egress"

pilot/pkg/proxy/envoy/v1/testdata/envoy-sidecar-auth.json.golden

@@ -6,7 +6,7 @@
   },
   "admin": {
     "access_log_path": "/dev/stdout",
-    "address": "tcp://127.0.0.1:15000"
+    "address": "tcp://[::1]:15000"
   },
   "cluster_manager": {
     "clusters": [

pilot/pkg/proxy/envoy/v1/testdata/envoy-sidecar.json.golden

@@ -6,7 +6,7 @@
   },
   "admin": {
     "access_log_path": "/dev/stdout",
-    "address": "tcp://127.0.0.1:15000"
+    "address": "tcp://[::1]:15000"
   },
   "cluster_manager": {
     "clusters": [

pilot/pkg/proxy/envoy/v1/testdata/lds-httpproxy.json.golden

@@ -1,8 +1,8 @@
 {
   "listeners": [
    {
-    "address": "tcp://127.0.0.1:15002",
-    "name": "http_127.0.0.1_15002",
+    "address": "tcp://[::1]:15002",
+    "name": "http_[::1]_15002",
     "filters": [
      {
       "type": "read",

pilot/pkg/proxy/envoy/v1/testdata/lds-ingress.json.golden

@@ -1,8 +1,8 @@
 {
   "listeners": [
    {
-    "address": "tcp://0.0.0.0:80",
-    "name": "http_0.0.0.0_80",
+    "address": "tcp://[::]:80",
+    "name": "http_[::]_80",
     "filters": [
      {
       "type": "read",
@@ -76,8 +76,8 @@
     "bind_to_port": true
    },
    {
-    "address": "tcp://0.0.0.0:443",
-    "name": "http_0.0.0.0_443",
+    "address": "tcp://[::]:443",
+    "name": "http_[::]_443",
     "filters": [
      {
       "type": "read",