[US183] updating fact that requires chef convergence doesn't trigger chef convergence

[breu]

Updating fact cpu_allocation_ratio from 16 to 32 doesn't actually trigger chef convergence

example:
opencentercli fact update 26 26 32

Creates an adventurate task that sets the fact bug does not trigger chef convergence

[git-harry]

opencenter does not currently support updating facts on a node that has children.
9db06f8 now has this return a 403 if this is attempted instead of being undefined.