Revert "tests: don't wait for lianad to log on shutdown"

This reverts commit 97abc4699c7343e4be6a0596a25481f9e07bb3bb.

tests/test_framework/lianad.py

@@ -127,6 +127,9 @@ class Lianad(TailableProc):
     def stop(self, timeout=5):
         try:
             self.rpc.stop()
+            self.wait_for_log(
+                "Stopping the liana daemon.",
+            )
             self.proc.wait(timeout)
         except Exception as e:
             logging.error(f"{self.prefix} : error when calling stop: '{e}'")