Comment 3 for bug 1725248

I'm putting checks into dbpf, dbgf, dbtpf, dbtpf and dbtr so they won't try to call dbAccess routines and hence try to use dbScanLock() if the addr.precord->lset field is NULL (this gets initialized when the locksets are calculated, and should work with both the old and new dbLock.c implementations.

Changes to allow dbgf or dbpf to be used before iocInit would be enhancements and are out of scope of this bug fix.