HEAD-1330: simplify node.config creation a bit with newer jsontool features
HEAD-1330: simplify node.config creation a bit with newer jsontool features

kaizengarden/sdc-headnode,numericillustration/sdc-headnode,numericillustration/sdc-headnode,joyent/sdc-headnode,kaizengarden/sdc-headnode,joyent/sdc-headnode,joyent/sdc-headnode,kaizengarden/sdc-headnode,numericillustration/sdc-headnode,kaizengarden/sdc-headnode,joyent/sdc-headnode