In this commit, we add a new integration tests to exercise the fix
introduced in the prior commit. In this test, we reconstruct a scenario
for a 3rd party to sweep an anchor spend after force closing, causing a
prior spend we had to be invalidated. Without the prior commit, this test
fails as the original anchor sweep is still found in the wallet.
This commit was previously split into the following parts to ease
review:
- 2d746f68: replace imports
- 4008f0fd: use ecdsa.Signature
- 849e33d1: remove btcec.S256()
- b8f6ebbd: use v2 library correctly
- fa80bca9: bump go modules
This commit removes the context as a param needed when calling methods
of HarnessNode. This change moves the context management inside
HarnessNode, aside from saving us a few lines, it makes the context
creation/timeout less error-prone.
