fixes #2726 - smart class parameter override fails validation

fixes #4234 - cannot edit host's puppet parameters

fixes #3725, #4167 - root password validations, remove default password

fixes #3999 - refactor DRY implementation of "nested label" for objects with ancestry

fixes #3553 - add "except" option to prevent puppet class import to select types of import

fixes #4005 - ensure standalone Rabl.render works outside of a controller

fixes #2866 - Changing a hostgroup name doesn't update associated Smart Variable matchers

fixes #3960 - wrap APIv2 errors in an "error" node

refs #3697, #3701 - fix test with multiple validation failures

fixes #3697, #3701 - more comprehensive field validations