s3: smb2: Move from using SBVAL to put NTTIMEs on the wire to put_long_date_timespec.

s3: smb2: Move from using SBVAL to put NTTIMEs on the wire to put_long_date_timespec.

put_long_date_timespec() correctly calls round_timespec()
on the time parameters, and is the correct function to
use when writing *any* file-based NTTIME on the wire.

Move from using NTTIME variables internally
in the server to struct timespec variables, which is
what all the other server code uses. Only map to
NTTIME as the last step of marshalling the output
data.

The previous SMB2 create code missed the round_timespec()
call before marshalling.

Bug 3124 - xcopy /d with samba shares works not as aspected

https://bugzilla.samba.org/show_bug.cgi?id=3124

which is a regression from a long-ago bug with
SMB1.

Signed-off-by: Jeremy Allison <jra@samba.org>