header-to-metadata: rename on_header_present and on_header_missing fields (#12385)

Signed-off-by: Radha Kumari <rkumari@slack-corp.com>

Mirrored from https://github.com/envoyproxy/envoy @ fd4e76f7d13245e9a31b800a6b4387e1e8e43220

envoy/extensions/filters/http/header_to_metadata/v3/header_to_metadata.proto

@@ -109,13 +109,13 @@ message Config {
     //
     // If the value in the KeyValuePair is non-empty, it'll be used instead
     // of the header or cookie value.
-    KeyValuePair on_header_present = 2;
+    KeyValuePair on_header_present = 2 [(udpa.annotations.field_migrate).rename = "on_present"];
 
     // If the header or cookie is not present, apply this metadata KeyValuePair.
     //
     // The value in the KeyValuePair must be set, since it'll be used in lieu
     // of the missing header or cookie value.
-    KeyValuePair on_header_missing = 3;
+    KeyValuePair on_header_missing = 3 [(udpa.annotations.field_migrate).rename = "on_missing"];
 
     // Whether or not to remove the header after a rule is applied.
     //

envoy/extensions/filters/http/header_to_metadata/v4alpha/header_to_metadata.proto

@@ -107,13 +107,13 @@ message Config {
     //
     // If the value in the KeyValuePair is non-empty, it'll be used instead
     // of the header or cookie value.
-    KeyValuePair on_header_present = 2;
+    KeyValuePair on_present = 2;
 
     // If the header or cookie is not present, apply this metadata KeyValuePair.
     //
     // The value in the KeyValuePair must be set, since it'll be used in lieu
     // of the missing header or cookie value.
-    KeyValuePair on_header_missing = 3;
+    KeyValuePair on_missing = 3;
 
     // Whether or not to remove the header after a rule is applied.
     //