Add test to check execution of bogus transactions
Add test to check execution of bogus transactions

Bogus here means transactions, for which the `Transaction::execute()`
method returns `false`.

alekseysidorov/exonum,exonum/exonum,exonum/exonum,alekseysidorov/exonum,alekseysidorov/exonum,alekseysidorov/exonum,exonum/exonum,exonum/exonum