7afddfa8cefd01249ad59cf2370e7cec90b34f6f importmulti: Don't add internal addresses to address book (Gregory Sanders)
Pull request description:
Currently anything imported with `internal` will not be treated as change since checking the address book is a primary test of this.
Added basic tests of all combinations of arguments and change identification.
Resolves https://github.com/bitcoin/bitcoin/issues/14662
Tree-SHA512: a1f08dc624a3fadee93cc5392d50c4796b0c5eedf38e295382f71570f2066d9e978ed6e3962084b902989863fe1273a8642d8fdb094a266d69de10622a4176b0
Backport of Core PR14679
https://github.com/bitcoin/bitcoin/pull/14679/