Resolve "[users_and_groups] specific user parameters' values for a host"
requested to merge 22-users_and_groups-refactor-to-fix-and-enhance-users-and-groups-management into main
Closes #23 (work item). Before big refactor (#22), basic solution (thanks @apias) to solve this idempotency problem and implementation of work item 646 proposal.
Edited by Daniel Viñar Ulriksen