FormController.$setValidity should be able to reset child validation

[bjoernWahle]

I implemented a behaviour to add my server-side errors to my client-side angular errors. If I want to reset my form ($setPristine() and $setValidity()), only the general validation state of my form is reset.

My workaround for this was, to call $setValidity() for all fields of the form manually.

I think it would be nice to have method or an argument for $setValidity(), that resets child validation state as well.