Signed-off-by: Anthony Fieroni <bvbfan@abv.bg>
Adds a new wallet_util.py module and moves generic helper functions there: - get_key - get_multisig - test_address
- changes importprivkey behavior to overwrite existent label if one is passed and keep existing ones if no label is passed - tests behavior of importprivkey on existing address labels and different same key destination