Fix test_blocks
Fix test_blocks

Apparently a lot of things have changed, since this test was written...

RomanZacharia/pyethapp,changwu-tw/pyethapp,gsalgado/pyethapp,ethereum/pyethapp,gsalgado/pyethapp,changwu-tw/pyethapp,vaporry/pyethapp,ethereum/pyethapp,RomanZacharia/pyethapp,d-das/pyethapp