Merge #11743: qa: Add multiwallet prefix test
fa61c6f6a qa: Add multiwallet prefix test (MarcoFalke)
Pull request description:
Fixes https://github.com/bitcoin/bitcoin/pull/10849#discussion_r127847938
Tree-SHA512: 7967be04e76d935398b3bea60c864ffc9e38dbb4cfb55890bb146a6f16c28d81ca5d89736275e2d0b03642806f6f7093beeea979f5257c464f437c4e5a9684f1
Core PR11743
Fixes T177