[tests] log thread names by default in functional tests

Author: jnewbery

test/functional/test_framework/test_node.py

@@ -84,6 +84,7 @@ def __init__(self, i, datadir, *, rpchost, timewait, bitcoind, bitcoin_cli, cove
             self.binary,
             "-datadir=" + self.datadir,
             "-logtimemicros",
+            "-logthreadnames",
             "-debug",
             "-debugexclude=libevent",
             "-debugexclude=leveldb",