Close the listener in the parent process
The namespace sandbox spawn a process that set the namespaces and wait for the for worker process to finish.
The worker process drops the vhost::Listener after the first
accept(). However, util::wait_forchild() never returns, so
the parent keeps all the FDs open, like the socket's FD in a
listen state. This is problematic because nothing prevents a
miss configured VMM to try to connect twice to the same socket
leaving the VMM waiting forever.
Edited by German Maglione