In this commit, we test all the combinations of rbf close and taproot
chans. This ensures that the downgrade logic works properly.
Along the way we refactor the tests slightly, and also split them up, as
running all the combos back to back mines more than 50 blocks in a test,
which triggers an error in the itest sanity checks.
Starting from this commit, we begin the process of flattening the
multi-hop itests to make them easier to be maintained. The tests are
refactored into their own test cases, with each test focusing on testing
one channel type. This is necessary to save effort for future
development.
These tests are also updated to reflect the new `blockbeat` behavior.
This commit extends our healtcheck with an optional leader check. This
is to ensure that given network partition or other cluster wide failure
we act as soon as possible to avoid a split-brain situation where a new
leader is elected but we still hold onto our etcd client.
With this commit we create a new function that returns system wide
unique ports by using a single file to keep track of previously used
ports. We'll want to use this everywhere whenever we need to listen on a
new, random port during unit or integration tests.
Because we now have a unique source, we don't need to apply the port
offset that was used for the different tranches of parallel running
integration tests before.
