message: Rework opreturn_send test.
diff: #include "chain.h" // Freeze CBlockIndex
  #include "base58.h" // Freeze CBitcoinAddress
  -#ifdef ENABLE_WALLET
  #include "wallet/wallet.h" // Freeze wallet test
  #include "wallet/wallet_ismine.h"
  -#endif
  #include <boost/foreach.hpp>
  #include <boost/test/unit_test.hpp>
  