Thanks so much to Thierry for finding out this bug.
Bug Description: Commit 69ff83598d517bed84922b1c7dd67cab023b4d99
had a flaw -- handling normdn in upgradedn_producer had a
problem. The string was passed to the Slapi_DN in the entry
using slapi_sdn_init_dn_passin, while the string could be
modified at other places.
Fix Description: This patch manages the normdn string more