for LDBM backends called "dbsync", which takes minimum of one argument up
to 3 args which are sync frequency, # of delays, and delay periods.  See
man page update for "dbsync" configuration for more details.

Needs to be connection specific

need to rework cert check to use per lconn host name

backendsyncfreq <seconds>.  Setting this automatically enables
dbnosync (because the synchronizer takes care of it).

files.  Don't call set_cachesize if dbcachesize = 0.

integer-pointer conversions errors in librewrite (on FreeBSD 4.2).

dbcachesize setting actually work for db-3.2.9.