More IPv6/address transparency changes for STR #1313.

More IPv6/address transparency changes for STR #1313.

config-scripts/cups-network.m4:
    - Add check for getnameinfo().
    - Remove --enable-domainsocket, just use --with-domainsocket.

config.h.in:
    - Add HAVE_GETNAMEINFO and change CUPS_DEFAULT_DOMAINSOCKET
      to be #undef by default.

cups/globals.h:
    - Remove domain_socket.
    - Add servername.

cups/http-addr.c:
    - Use getnameinfo() when available, fix IPv6 address
      formatting.

cups/http.c:
    - Move httpDateString(), httpDateString2(), httpDateTime(),
      httpDecode64(), httpDecode64_2(), httpEncode64(), and
      httpEncode64_2() to http-support.c.

cups/http.h:
    - Add httpSeparate3() and http_uri_status_t.

cups/http-support.c:
    - httpSeparate3(): Added;
    - Move httpDateString(), httpDateString2(), httpDateTime(),
      httpDecode64(), httpDecode64_2(), httpEncode64(), and
      httpEncode64_2() to http-support.c.

cups/usersys.c:
    - cupsServer(): Fix domain socket support so that we use
      domain sockets by default when available.
    - cupsSetServer(): Support port name/number in server name.

scheduler/conf.c:
    - get_address(), read_configuration(): Check for IPv6 address
      after we find the last colon in the value.

git-svn-id: svn+ssh://src.apple.com/svn/cups/cups.org/trunk@4760 7a7537e8-13f0-0310-91df-b6672ffda945