This commit removes the panic used in checking the shutdown log.
Instead, the error is returned and asserted in `shutdownAllNodes` so
it's easier to check which node failed in which test. We also catch all
the errors returned from `StopDaemon` call to properly access the
shutdown behavior.
Soemtimes the node may be hanging for a while without being noticed,
causing failures in its following tests, thus making the debugging
extrememly difficult. We now assert the node has been shut down from the
logs to assert the shutdown process behaves as expected.
In this commit, we start to print the PID of node's we created within an
itest. This is useful when debugging itests with `dlv` by attaching to a
given node. By printing out the PID, we facilitate such debugging
attempts.
In this commit we add the LND node name to the temporary directory's
name. This change makes it easier to identify a particular test node's
temporary directory.
This commit also replaces the depreciated `ioutil.TempDir` function call
with `os.MkdirTemp`.
