update rpcmetadata namespace to an open source friendly one

Summary:
update rpcmetadata namespace to an open source friendly one

This way we can avoid copying the code into thrift/lib/go/thrift in future and rather import the generated code

Reviewed By: podtserkovskiy

Differential Revision: D63014121

fbshipit-source-id: 74d08d3f03dd0d228b95882a24826790354f871d

third-party/thrift/src/thrift/compiler/generate/t_mstch_cpp2_generator.cc

@@ -133,7 +133,8 @@ std::vector<t_annotation> get_fatal_annotations(
 }
 
 std::string get_fatal_string_short_id(const std::string& key) {
-  return boost::algorithm::replace_all_copy(key, ".", "_");
+  return boost::algorithm::replace_all_copy(
+      boost::algorithm::replace_all_copy(key, ".", "_"), "/", "_");
 }
 std::string get_fatal_string_short_id(const t_named* node) {
   // Use the unmodified cpp name.
@@ -144,6 +145,7 @@ std::string get_fatal_namespace_name_short_id(
     const std::string& lang, const std::string& ns) {
   std::string replacement = lang == "cpp" || lang == "cpp2" ? "__" : "_";
   std::string result = boost::algorithm::replace_all_copy(ns, ".", replacement);
+  result = boost::algorithm::replace_all_copy(result, "/", "_");
   return result;
 }
 

third-party/thrift/src/thrift/lib/thrift/RpcMetadata.thrift

@@ -26,7 +26,7 @@ namespace php Thrift_RpcMetadata
 namespace py thrift.lib.thrift.RpcMetadata
 namespace py.asyncio thrift.lib.thrift.asyncio.RpcMetadata
 namespace py3 thrift.lib.thrift
-namespace go thrift.lib.thrift.rpcmetadata
+namespace go 'github.com/facebook/fbthrift/thrift/lib/thrift/rpcmetadata'
 
 include "thrift/annotation/thrift.thrift"
 include "thrift/annotation/cpp.thrift"