I snagged the license boiler plate. Fix that. also, it's spelled .Va not .Vn. Plus " quoting issues. Noticed by: rgrimes, xtouqh at hotmail dot com
This routine centralizes the knowledge needed for properly quoting 'value' in all key="value" items that appear in devctl messages. Reviewed by: bcr Differential Revision: https://reviews.freebsd.org/D26520