puppetize icinga2 configuration and checks on pergamon

As noted in T472, the icinga2 configuration on pergamon has been done by hand, we should puppetize it in full.

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Migrated from T522 (view on Phabricator)

added Language-Puppet Post FOSDEM'17 consolidation Puppet recipes System administration priority:Normal labels

as noted by @olasd on IRC, this Puppet module to deploy Icinga 2 looks promising: https://github.com/Icinga/puppet-icinga2

I'm a bit nervous about importing a puppet module with a long-lived (> 1 year) develop branch that is 160 commits ahead of master, but it seems to be the reasonable thing to do in the long run...

The icinga configuration is now in puppet.

closed