message: Change error message format to append, not prepend, version warning.
diff: @@ -470,17 +470,17 @@ Status MaybeAppendVersionWarning(const VersionDef* versions,
  return Status(
  import_status.code(),
  absl::StrCat(
  - "Converting GraphDef to Graph has failed. The binary trying to "
  - "import the GraphDef was built when GraphDef version was ",
  + "Converting GraphDef to Graph has failed with an error: '",
  + import_status.error_message(),
  + "' The binary trying to import the GraphDef was built when "
  + "GraphDef version was ",
  TF_GRAPH_DEF_VERSION,
  ". The GraphDef was produced by a binary built when GraphDef "
  "version was ",
  versions->producer(),
  ". The difference between these versions is larger than "
  - "TensorFlow's forward compatibility guarantee. The following error "
  - "might be due to the binary trying to import the GraphDef being "
  - "too old: ",
  - import_status.error_message()));
  + "TensorFlow's forward compatibility guarantee, and might be the "
  + "root cause for failing to import the GraphDef."));
  }
  return import_status;
  }
  