Daemon: don't clear CLOEXEC on daemon sockets

Daemon: don't clear CLOEXEC on daemon sockets

They were leaking into processes blocking full restarts of
the daemons.

Note that perl's fcntl doesn't work on numeric
filedescriptors (neither does POSIX::fcntl, which even stays
silent about it and returns EBADF without ever trying to
actually perform the fcntl syscall), so the socket handles
need to be stored ($daemon_sockets).
The flag is added back when the socket gets reopened.