Remove check for required fields in model objects
Remove check for required fields in model objects

The swager generator has issue that marks some parameters as required
even when they are not:
https://github.com/swagger-api/swagger-core/issues/1857

project-ncl/pnc-cli,janinko/pnc-cli,janinko/pnc-cli,janinko/pnc-cli,project-ncl/pnc-cli,project-ncl/pnc-cli