Status formatter oneline

https://docs.google.com/a/canonical.com/document/d/1olIjfnMIKPbNMmNBhfjwlnzdRvY-xBKygpIOhv7QIkE/edit

Fulfills feature "Pretty Printing"
can you add a type assertion hee

fs, ok := value.(formattedStatus)
if !ok {
     return nil, errors.Errorf("expected formattedStatus, got %T", formattedStatus)
}