This command was originally added by https://github.com/moby/libnetwork/commit/ea7f555446401de09fc2410aba691bf70bbb2dee to test the code snippet put into libnet's README.md. Nothing compiles this file and it doesn't add any value to the project. So better remove it than maintaining it. This commit also removes the code snippet from libnet's README.md for the same reasons. Signed-off-by: Albin Kerouanton <albinker@gmail.com>