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",