Description of problem: in osp 17 using parameter_defaults causes variable files to override each other instead of joining all the vars together we would like to be able to use parameter_defaults in several different files to have our settings separated (for readability and reusability) Version-Release number of selected component (if applicable): 17 How reproducible: Steps to Reproduce: 1. deploy overcloud with parameter_defaults divided over multiple files 2. 3. Actual results: vars are being overriden Expected results: all vars are accounted for Additional info: