Change Details

- 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 This is a backport of Core PR13381 . I had to modify heavily the last test to create a P2SH manually. Bitcoin Core does produce a segwit wrapped into P2SH address by default so this isn't a problem for them.

- 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 This is a backport of Core [[https://github.com/bitcoin/bitcoin/pull/13381 | PR13381]] . I had to modify heavily the last test to create a P2SH manually. Bitcoin Core does produce a segwit wrapped into P2SH address by default so this isn't a problem for them.

- 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 This is a backport of Core [[https://github.com/bitcoin/bitcoin/pull/13381 | PR13381]] . I had to modify heavily the last test to create a P2SH manually. Bitcoin Core does produce a segwit wrapped into P2SH address by default so this isn't a problem for them.