KRACOEUS-7931 kns lookup using KNS lookupable helper, leaving krad searc...

KRACOEUS-7931 kns lookup using KNS lookupable helper, leaving krad search using krad helper.  KcPersonLookupableHelperServiceKNSImpl was pulled from the 5.x code base.  There is currently a freemarker exception happening in proposal that happens regardless of my change being in place or not, so I can't verify that this change doesn't negatively impact proposal.