Turn rpcauth.py test into functional test

test/functional/test_runner.py

@@ -353,6 +353,7 @@ BASE_SCRIPTS = [
     'rpc_getdescriptorinfo.py',
     'rpc_mempool_info.py',
     'rpc_help.py',
+    'tool_rpcauth.py',
     'p2p_handshake.py',
     'p2p_handshake.py --v2transport',
     'feature_dirsymlinks.py',