Merge branch 'marka-silence-flake8-warning-v9_16' into 'v9_16'

Silence: E741 ambiguous variable name 'l'

See merge request isc-projects/bind9!3524

bin/tests/system/dnstap/ydump.py

@@ -25,5 +25,5 @@ DATAFILE = sys.argv[2]
 ARGS = [DNSTAP_READ, '-y', DATAFILE]
 
 with subprocess.Popen(ARGS, stdout=subprocess.PIPE) as f:
-    for l in yaml.load_all(f.stdout):
-        pprint.pprint(l)
+    for y in yaml.load_all(f.stdout):
+        pprint.pprint(y)