Recent changes to the funding manger’s state machine have resulted in
some additional database calls during the funding process. This has
slowed down the tests by a few ms here and there. Recent integration
test runs have begun to fail due to AssertChannelExists returning an
error as the channel hasn’t fully propagated yet. In order to remedy
this, we’ll now use WaitPredicate to poll repeatedly to ensure. This
should serve to reduce flakes encountered within the integration tests.
In this commit, we add a new helper function to the NetworkHarness
struct. This helper function serves to allow test authors to look up
pointer to an active node based on its current public key.
Each time a new node is started, its public key will be re-registered
within the global nodesByPub map.
