dn_parent(" ") returns NULL
	dn2entry logs if dn2id returns id but id2entry doesn't return entry.

was never applied to -devel and hence doesn't need to be backed out.
NO ACTUAL CHANGES are associated with log entry

This change will be backed out of devel once imported into release engineering
branchs.

Mainly comment on 'read' privs and provide references to man pages

to return entry lock with e == NULL.