BOLT5: fix claim backward revoked htlc success#322

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ariard wants to merge 2 commits intolightningdevkit:masterfrom

ariard:2019-03-fix-claim-backward-revoked-htlc-success

Commits on Mar 25, 2019

Extract preimage from revoked HTLC-Success to claim backward
Antoine Riard
committed
Extend test_justice_tx to test broadcast of revoked preimage
Antoine Riard
committed