transport/name.c: refine the address resolution logic when listen-host is not specified.

- when listen-host is not specified and there are are no interfaces having
    adresses belonging to the address-family specified, listen at 0.0.0.0/::0.

  - this patch is necessary since with AI_ADDRCONFIG, getaddrinfo fails if there
    are no active interfaces for the address family specified and when
    listen-host is specified we still want the functionality provided with
    usage of AI_ADDRCONFIG.
Signed-off-by: Corentin Chary <corentin.chary@gmail.com>
Signed-off-by: Anand V. Avati <avati@dev.gluster.com>

BUG: 339 (glusterfsd fails to start when there are no active interfaces having address in the address family configured.)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=339

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