Make the icinga check green

Closed Antoine R. Dumont requested to merge make-icinga-check-work into production

Varnish's default return for 401 enpdoint is '401 Restricted' while nginx's default is '401 Unauthorized' which rendered the previous check faulty.

Tested on pergamon with the following and it's ok. And 401 is part of the existing check so it's retro-compatible with other checks.

Refs. swh/infra/sysadm-environment#4525

Edited by Antoine R. Dumont

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