Merge bitcoin/bitcoin#27280: test: Fix TypeError (expected str instance, bytes found) in wait_for_debug_log

33337eb test: Fix TypeError in wait_for_debug_log (MarcoFalke)

Pull request description:

ACKs for top commit:
  davidgumberg:
    tACK bitcoin/bitcoin@33337eb

Tree-SHA512: e641f23f0adc074d12b0ee10cab5845c16f3ac2858e42f895c69857c375fcb15c31bc1c9476bf2b6e2b49d0d2db4944687733da16d4a464152ae3323cbc6ca68

Author: fanquake

test/functional/test_framework/test_node.py

@@ -469,7 +469,7 @@ def wait_for_debug_log(self, expected_msgs, timeout=60):
                 return
 
             if time.time() >= time_end:
-                print_log = " - " + "\n - ".join(log.splitlines())
+                print_log = " - " + "\n - ".join(log.decode("utf8", errors="replace").splitlines())
                 break
 
             # No sleep here because we want to detect the message fragment as fast as