* 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

dmonakhov/haggle,dmonakhov/haggle,dmonakhov/haggle,dmonakhov/haggle,dmonakhov/haggle,dmonakhov/haggle,dmonakhov/haggle,dmonakhov/haggle,dmonakhov/haggle