python: Normalize quotes with Black.

Signed-off-by: Anders Kaseorg <anders@zulip.com>

scripts/nagios/check-rabbitmq-consumers

@@ -19,14 +19,14 @@ states = {
     3: "UNKNOWN",
 }
 
-if 'USER' in os.environ and not os.environ['USER'] in ['root', 'rabbitmq']:
+if "USER" in os.environ and not os.environ["USER"] in ["root", "rabbitmq"]:
     print("This script must be run as the root or rabbitmq user")
 
 
 usage = """Usage: check-rabbitmq-consumers --queue=[queue-name] --min-threshold=[min-threshold]"""
 
 parser = argparse.ArgumentParser(usage=usage)
-parser.add_argument('--min-threshold', dest='min_count', type=int, default=1)
+parser.add_argument("--min-threshold", dest="min_count", type=int, default=1)
 
 options = parser.parse_args()
 
@@ -34,7 +34,7 @@ config_file = get_config_file()
 TORNADO_PROCESSES = len(get_tornado_ports(config_file))
 
 output = subprocess.check_output(
-    ['/usr/sbin/rabbitmqctl', 'list_consumers'], universal_newlines=True
+    ["/usr/sbin/rabbitmqctl", "list_consumers"], universal_newlines=True
 )
 
 consumers: Dict[str, int] = defaultdict(int)
@@ -42,15 +42,15 @@ consumers: Dict[str, int] = defaultdict(int)
 queues = {
     *normal_queues,
     # These queues may not be present if settings.TORNADO_PROCESSES > 1
-    'notify_tornado',
+    "notify_tornado",
 }
 
 for queue_name in queues:
     queue_name = queue_name.strip()
     consumers[queue_name] = 0
 
-for line in output.split('\n'):
-    parts = line.split('\t')
+for line in output.split("\n"):
+    parts = line.split("\t")
     if len(parts) >= 2:
         queue_name = parts[0]
         if queue_name.startswith("notify_tornado_"):