* Add check to make sure Security tags are not added more than once to the same node description
* Add check to make sure Security tags are not added more than once to the same node description

eebenson/haggle,eebenson/haggle,eebenson/haggle,eebenson/haggle,eebenson/haggle,eebenson/haggle,eebenson/haggle,eebenson/haggle,eebenson/haggle,eebenson/haggle