s3: libsmb: Add utility function sockaddr_storage_to_samba_sockaddr().

s3: libsmb: Add utility function sockaddr_storage_to_samba_sockaddr().

As requested by Andreas and Metze, ensure new code uses
struct samba_sockaddr. This is part of changing dns_lookup_list_async()
and callers to use struct samba_sockaddr.

Currently putting this into namequery.c even though it's
used inside dsgetdcname.c as I have future patches that
heavily make use of this to convert sockaddr_storage -> samba_sockaddr.

I'm not committed to putting it here, it may fit better
in lib/util/util_net.[ch]. It just needs to be somewhere
other functions inside source/libsmb/*.c can get to it,
and currently namequery.h exports the most stuff.

Not yet used.

Signed-off-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>