api: rename ConnectionSourceType::LOCAL to SAME_IP_OR_LOOPBACK. (#9518)

Also Utility::isLocalConnection() to Utility::isSameIpOrLoopback(). The
idea is to improve descriptive accuracy, see
https://github.com/envoyproxy/envoy/pull/7840#issuecomment-524002499.

Risk level: Low
Testing: additional protoxform golden test added for enum value renames.

Fixes #8081

Signed-off-by: Harvey Tuch <htuch@google.com>

Mirrored from https://github.com/envoyproxy/envoy @ 2a9175a41ec8075af7f8429555825c8bc2dcdce2

envoy/api/v2/listener/BUILD

@@ -8,5 +8,6 @@ api_proto_package(
     deps = [
         "//envoy/api/v2/auth:pkg",
         "//envoy/api/v2/core:pkg",
+        "@com_github_cncf_udpa//udpa/annotations:pkg",
     ],
 )

envoy/api/v2/listener/listener.proto

@@ -10,6 +10,7 @@ import "google/protobuf/any.proto";
 import "google/protobuf/struct.proto";
 import "google/protobuf/wrappers.proto";
 
+import "udpa/annotations/migrate.proto";
 import "validate/validate.proto";
 
 option java_package = "io.envoyproxy.envoy.api.v2.listener";
@@ -72,7 +73,7 @@ message FilterChainMatch {
     ANY = 0;
 
     // Match a connection originating from the same host.
-    LOCAL = 1;
+    LOCAL = 1 [(udpa.annotations.enum_value_migrate).rename = "SAME_IP_OR_LOOPBACK"];
 
     // Match a connection originating from a different host.
     EXTERNAL = 2;

envoy/api/v3alpha/listener/listener.proto

@@ -76,7 +76,7 @@ message FilterChainMatch {
     ANY = 0;
 
     // Match a connection originating from the same host.
-    LOCAL = 1;
+    SAME_IP_OR_LOOPBACK = 1;
 
     // Match a connection originating from a different host.
     EXTERNAL = 2;