another post-commit fix for change 3114: call dns_db_resigned()/ dns_db_setsigningtime() only when incrementally resigning, not other times.
another post-commit fix for change 3114: call dns_db_resigned()/
dns_db_setsigningtime() only when incrementally resigning, not other
times.

each/bind9-collab,pecharmin/bind9,pecharmin/bind9,pecharmin/bind9,pecharmin/bind9,each/bind9-collab,each/bind9-collab,pecharmin/bind9,pecharmin/bind9,each/bind9-collab,each/bind9-collab,each/bind9-collab