daemon: explicitly bind to wildcard address.

daemon: explicitly bind to wildcard address.

with the recent change in pve-manager pveproxy (and spiceproxy)
try binding to '::' per default. This fails for hosts having disabled
ipv6 via kernel commandline.

Our desired behavior of binding on '::' and only falling back to
'0.0.0.0' in case this is not supported is not directly possible with
IO::Socket::IP->new (or rather by Socket::GetAddrInfo, which at least
on my system always returns the v4 wildcard-address first).

the code now binds to:
* the provided $host if not undef
* '::' if $host is not set
* '0.0.0.0' if $host is not set and binding on '::' yields undef,
  which means that it failed to create a socket which normally means
  that IPv6 is disabled

Signed-off-by: Stoiko Ivanov <s.ivanov@proxmox.com>
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>