Install a web interface to our monitoring software

Part of the deployment of our monitoring system is to have a web interface to it.

Icingaweb2 is available in Stretch and installable from there on Jessie. Upstream offers a puppet-icingaweb2 module we can use.

As for our other internet facing services, it should work over HTTPS only, and be protected by a htpassword.

Original created by @bertagaz on 11194 (Redmine)

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