r2599 - considerConfiguredConstraint(): move constraint handling here from trigger_isloadbalancer(), which becomes trivial
- trigger_ipv4(): employ considerConfiguredConstraint()
- trigger_natv4(): idem
- getIPv4LBList(): phased out, its code merged into getNarrowObjectList()
- getNarrowObjectList(): expect constraint name instead of type list
- IPV4LB_LISTSRC: adjusted default value
- NAMEFUL_OBJTYPES: replaced with NAMEWARN_LISTSRC
- REQUIRE_ASSET_TAG_FOR: replaced with ASSETWARN_LISTSRC
- IPV4_PERFORMERS: replaced with IPV4OBJ_LISTSRC
- NATV4_PERFORMERS: replaced with IPV4NAT_LISTSRC