sockaddr: print sin6_flowinfo field before sin6_addr

sockaddr: print sin6_flowinfo field before sin6_addr

The sin6_flowinfo field comes before sin6_addr in the sockaddr_in6
defintion, but for some reason we switch the order when decoding.
This patch fixes the order of decoding.

* sockaddr.c (print_sockaddr_data_in6): Print sin6_flowinfo field
before sin6_addr.
* NEWS: Mention this fix.
* tests/group_req.c (main): Update expected output.
* tests/net-sockaddr.c (check_in6_linklocal, check_in6): Likewise.
* tests/net-yy-inet6.c (INADDR_STR, SA_FIELDS): Likewise.
* tests/sockaddr_xlat.c (validate_in6): Likewise.