daemon: allow more than one host addresses given via --listen

Hi, here is version 2 of my patch. I hope i considered all of your hints Junio.

The patch currently does not support the --listen=host:port format, but I will look if it could be done. The problem that I currently see: For IPv6 it should be handle [ipv6-address]:port correctly. But anyway it should be a patch on top of this patch.

Thanks, Alex

 Documentation/git-daemon.txt | Alexander Sulfrian (2):
  daemon: add helper function named_sock_setup
  daemon: allow more than one host address given via --listen

 Documentation/git-daemon.txt |    1 +
 daemon.c                     |   62 +++++++++++++++++++++++++++++------------
 2 files changed, 45 insertions(+), 18 deletions(-)