[net] remove unused Socket::GetSockError() method

Change-Id: I74590637c08f303280b05eea9c9d7860918e054c
Reviewed-on: http://gerrit.cloudera.org:8080/20888
Reviewed-by: Abhishek Chennaka <achennaka@cloudera.com>
Tested-by: Alexey Serbin <alexey@apache.org>
2 files changed