Fix style

[FlorentClarret]

What does this PR do?

Fix style issues in datadog_checks_dev

Motivation

We bumped flake8 and missed the errors

https://dev.azure.com/datadoghq/integrations-core/_build/results?buildId=122022&view=logs&jobId=40b3f23d-1644-5d89-acd8-67daa1a59c69&j=40b3f23d-1644-5d89-acd8-67daa1a59c69&t=1cb4eb6e-5673-5999-7c1c-994687145201

Additional Notes

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• PR title must be written as a CHANGELOG entry (see why)
• Files changes must correspond to the primary purpose of the PR as described in the title (small unrelated changes should have their own PR)
• PR must have changelog/ and integration/ labels attached
• If the PR doesn't need to be tested during QA, please add a qa/skip-qa label.

[codecov]

Codecov Report

Merging #13518 (7a712ce) into master (786fa2e) will increase coverage by 0.16%.
The diff coverage is n/a.

Flag	Coverage Δ
activemq_xml	82.31% <ø> (ø)
airflow	90.00% <ø> (ø)
ambari	85.75% <ø> (ø)
apache	95.08% <ø> (ø)
arangodb	98.21% <ø> (ø)
argocd	88.13% <ø> (ø)
avi_vantage	92.50% <ø> (ø)
azure_iot_edge	82.00% <ø> (ø)
boundary	100.00% <ø> (ø)
btrfs	82.91% <ø> (ø)
cacti	87.90% <ø> (ø)
calico	83.33% <ø> (ø)
cert_manager	77.41% <ø> (ø)
cilium	75.34% <ø> (+0.93%)	⬆️
cisco_aci	95.27% <ø> (ø)
citrix_hypervisor	87.50% <ø> (ø)
cloud_foundry_api	95.98% <ø> (+0.12%)	⬆️
cockroachdb	90.96% <ø> (ø)
consul	91.64% <ø> (ø)
couchbase	83.58% <ø> (ø)
crio	89.79% <ø> (ø)
datadog_checks_base	89.51% <ø> (+0.35%)	⬆️
datadog_checks_dev	81.98% <ø> (+0.07%)	⬆️
datadog_checks_downloader	78.64% <ø> (+0.99%)	⬆️
datadog_cluster_agent	90.00% <ø> (ø)
directory	96.50% <ø> (ø)
disk	89.53% <ø> (-2.17%)	⬇️
dns_check	93.90% <ø> (ø)
druid	97.70% <ø> (ø)
ecs_fargate	80.05% <ø> (ø)
eks_fargate	94.05% <ø> (ø)
elastic	91.61% <ø> (ø)
envoy	94.23% <ø> (ø)
fluentd	94.77% <ø> (ø)
foundationdb	83.88% <ø> (ø)
gearmand	78.26% <ø> (+1.24%)	⬆️
gitlab_runner	91.94% <ø> (ø)
go_expvar	92.73% <ø> (ø)
gunicorn	92.85% <ø> (ø)
haproxy	95.12% <ø> (+0.16%)	⬆️
harbor	80.04% <ø> (ø)
hazelcast	92.39% <ø> (ø)
hdfs_datanode	89.74% <ø> (ø)
http_check	95.38% <ø> (+2.08%)	⬆️
ibm_ace	91.79% <ø> (ø)
ibm_i	81.95% <ø> (ø)
ibm_mq	91.08% <ø> (ø)
ibm_was	96.08% <ø> (ø)
iis	94.61% <ø> (+38.78%)	⬆️
impala	97.97% <ø> (ø)
istio	77.65% <ø> (+0.55%)	⬆️
kong	87.56% <ø> (ø)
kube_apiserver_metrics	97.69% <ø> (ø)
kube_controller_manager	96.00% <ø> (ø)
kube_dns	95.33% <ø> (ø)
kube_metrics_server	94.87% <ø> (ø)
kube_proxy	96.89% <ø> (ø)
kube_scheduler	96.53% <ø> (ø)
kubelet	90.96% <ø> (ø)
kubernetes_state	89.18% <ø> (ø)
kyototycoon	85.96% <ø> (ø)
lighttpd	83.64% <ø> (ø)
linkerd	85.14% <ø> (+1.14%)	⬆️
linux_proc_extras	96.22% <ø> (ø)
mapr	82.70% <ø> (ø)
mapreduce	81.77% <ø> (+0.46%)	⬆️
marathon	83.12% <ø> (ø)
marklogic	96.03% <ø> (ø)
mcache	93.26% <ø> (ø)
mesos_master	89.75% <ø> (ø)
mongo	96.49% <ø> (ø)
nagios	89.01% <ø> (ø)
network	93.92% <ø> (+0.95%)	⬆️
nfsstat	95.20% <ø> (ø)
nginx	95.24% <ø> (+0.54%)	⬆️
nginx_ingress_controller	98.36% <ø> (ø)
openldap	96.33% <ø> (ø)
openmetrics	97.90% <ø> (ø)
openstack	51.45% <ø> (ø)
openstack_controller	90.94% <ø> (ø)
oracle	90.26% <ø> (ø)
pgbouncer	91.33% <ø> (ø)
php_fpm	90.25% <ø> (+0.84%)	⬆️
postfix	88.04% <ø> (ø)
powerdns_recursor	96.65% <ø> (ø)
process	85.42% <ø> (+0.28%)	⬆️
prometheus	94.17% <ø> (ø)
pulsar	100.00% <ø> (ø)
rabbitmq	94.41% <ø> (ø)
rethinkdb	97.93% <ø> (ø)
riak	99.22% <ø> (ø)
riakcs	93.61% <ø> (ø)
silk	93.33% <ø> (ø)
singlestore	90.81% <ø> (ø)
snowflake	96.47% <ø> (ø)
spark	93.83% <ø> (+0.28%)	⬆️
squid	100.00% <ø> (ø)
statsd	87.36% <ø> (+1.05%)	⬆️
supervisord	92.30% <ø> (ø)
system_core	90.90% <ø> (ø)
system_swap	98.30% <ø> (ø)
tcp_check	91.58% <ø> (ø)
teradata	94.24% <ø> (ø)
tls	91.82% <ø> (+0.84%)	⬆️
tokumx	58.40% <ø> (?)
traffic_server	96.13% <ø> (ø)
twemproxy	79.45% <ø> (ø)
varnish	84.39% <ø> (+0.26%)	⬆️
yarn	89.14% <ø> (ø)

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