Fix and reformat several queries

src/pgmon.py

@@ -655,6 +655,7 @@ def test_queries():
     for name, metric in config["metrics"].items():
         # If the metric has arguments to use while testing, grab those
         args = metric.get("test_args", {})
+        print("Testing {} [{}]".format(name, ", ".join(["{}={}".format(key, value) for key, value in args.items()])))
         # Run the query without the ability to retry.
         try:
             res = sample_metric(dbname, name, args, retry=False)