Update H2Configuration test to use init params
Update H2Configuration test to use init params

Update all tests in TestH2Config to use the H2Configuration initializer
parameters and verify that attributes of that object indeed to get set
properly via those parameters.

Kriechi/hyper-h2,vladmunteanu/hyper-h2,vladmunteanu/hyper-h2,python-hyper/hyper-h2,Kriechi/hyper-h2,python-hyper/hyper-h2