[tests] log thread names by default in functional tests

test/functional/test_framework/test_node.py

@@ -84,6 +84,7 @@ class TestNode():
             self.binary,
             "-datadir=" + self.datadir,
             "-logtimemicros",
+            "-logthreadnames",
             "-debug",
             "-debugexclude=libevent",
             "-debugexclude=leveldb",