gencache: Convert to a binary timestamp
Two reasons:
The ascii conversion shows up on profiles.
In a further commit we will get checksums for gencache entries to
protect at hidden corruption due to a crash on the non-transactioned
gencache.tdb. Next to the timestamp this is a second field that is
gencache metadata, and I don't want to deal with a second ascii number
when at least some of the gencache values are binary already.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>