... instead of leaving the option unmanaged.
This also removes the reference in default definitions from the defined
resource type to the params class, which does not work if the params
class is not explicitly included in advance.
Unit tests coverage is also improved to ensure both default parameters
and customized parameters work.
Change-Id: I0b8199a27377a7d035f882586979a678b061e5da
e4bac84648