Go testing: add some exit commands
Go testing: add some exit commands

For less-intelligent netcats or netcats written in Go that
don't do shutdown()

Signed-off-by: Ronald G. Minnich <f569d0af9a3481c4007b95c7180d6c41009f2513@google.com>

klueska/go-akaros,klueska/go-akaros,klueska/go-akaros,klueska/go-akaros,klueska/go-akaros,klueska/go-akaros,klueska/go-akaros,klueska/go-akaros