Correct naming of older drafts

more than once at any given time.

Fixes the SEGVs from stack overrun, but slapd tends to get hung in select.

with each password-hash scheme.

and back-ldbm.

	Use a per-env locker ID
	Always set lock_detect, since we allow slapadd etc. concurrently
Also removed unused lock_detect_task code. lockdetect config keyword only
needs <policy>, no <seconds> argument.

name is an objectClass.