Remove WalletDatabase::Create, CreateMock, and CreateDummy
Remove WalletDatabase::Create, CreateMock, and CreateDummy

These are superseded by CreateWalletDatabase, CreateMockWalletDatabase,
and CreateDummyWalletDatabase


Former-commit-id: ac0c1e42d8df78a7ed8410d6a3496717cc8e4a8e
syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin