add prune and remove unused packages

vendor/google.golang.org/appengine/internal/remote_api/remote_api.proto

@@ -1,44 +0,0 @@
-syntax = "proto2";
-option go_package = "remote_api";
-
-package remote_api;
-
-message Request {
-  required string service_name = 2;
-  required string method = 3;
-  required bytes request = 4;
-  optional string request_id = 5;
-}
-
-message ApplicationError {
-  required int32 code = 1;
-  required string detail = 2;
-}
-
-message RpcError {
-  enum ErrorCode {
-    UNKNOWN = 0;
-    CALL_NOT_FOUND = 1;
-    PARSE_ERROR = 2;
-    SECURITY_VIOLATION = 3;
-    OVER_QUOTA = 4;
-    REQUEST_TOO_LARGE = 5;
-    CAPABILITY_DISABLED = 6;
-    FEATURE_DISABLED = 7;
-    BAD_REQUEST = 8;
-    RESPONSE_TOO_LARGE = 9;
-    CANCELLED = 10;
-    REPLAY_ERROR = 11;
-    DEADLINE_EXCEEDED = 12;
-  }
-  required int32 code = 1;
-  optional string detail = 2;
-}
-
-message Response {
-  optional bytes response = 1;
-  optional bytes exception = 2;
-  optional ApplicationError application_error = 3;
-  optional bytes java_exception = 4;
-  optional RpcError rpc_error = 5;
-}