dnsp.idl: fix the dnsp_dns_addr_array definition

dnsp.idl: fix the dnsp_dns_addr_array definition

The endian changes are needed in order to get the following result
from the blobs Windows generated (see the torture test):

  AddrArray: ARRAY(3)
      AddrArray: struct dnsp_dns_addr
          family                   : 0x0002 (2)
          port                     : 0x0035 (53)
          ipv4                     : 172.31.99.33
          ipv6                     : 0000:0000:0000:0000:0000:0000:0000:0000

[MS-DNSP] states that the port is supposed to be ignored, but it's still
good to decode it as port '53' (0x0035) instead of '13568' (0x3500).

BUG: https://bugzilla.samba.org/show_bug.cgi?id=13969

Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Garming Sam <garming@catalyst.net.nz>