Modernize kosmos-mediawiki

This has been done with the help of `cookstyle` which is very useful to
learn about breaking changes and updates in Chef.

On wiki-1 I managed to update Chef up to 17.10.163. For version 18 I ran
into an issue with the omnibus installer returning a 404

Refs #500

nodes/wiki-1.json

@@ -28,6 +28,7 @@
       "timezone_iii::debian",
       "ntp::default",
       "ntp::apparmor",
+      "kosmos-base::journald_conf",
       "kosmos-base::systemd_emails",
       "apt::unattended-upgrades",
       "kosmos-base::firewall",
@@ -66,12 +67,13 @@
     "cloud": null,
     "chef_packages": {
       "chef": {
-        "version": "15.13.8",
-        "chef_root": "/opt/chef/embedded/lib/ruby/gems/2.6.0/gems/chef-15.13.8/lib"
+        "version": "17.10.163",
+        "chef_root": "/opt/chef/embedded/lib/ruby/gems/3.0.0/gems/chef-17.10.163/lib",
+        "chef_effortless": null
       },
       "ohai": {
-        "version": "15.12.0",
-        "ohai_root": "/opt/chef/embedded/lib/ruby/gems/2.6.0/gems/ohai-15.12.0/lib/ohai"
+        "version": "17.9.7",
+        "ohai_root": "/opt/chef/embedded/lib/ruby/gems/3.0.0/gems/ohai-17.9.7/lib/ohai"
       }
     }
   },