Consensus: Minimal way to move dust out of consensus
Summary:
Backport of Core PR9279
https://github.com/bitcoin/bitcoin/pull/9279
Test Plan:
make check test_runner.py
Reviewers: deadalnix, jasonbcox, Fabien, markblundeberg, O1 Bitcoin ABC, #bitcoin_abc
Reviewed By: Fabien, O1 Bitcoin ABC, #bitcoin_abc
Differential Revision: https://reviews.bitcoinabc.org/D3039