Release 2018_018 (2018-06-27)

NixOS platform

• Rework journal check to avoid flooding the monitoring system with bulky output (#101691, #101730).

• Change PHP option mechanics for sendmail and timezone so they can be overwritten in local.nix (#103104).

• Update Graylog 2.4.0 -> 2.4.5 (#103090).

• Update loghosts to use to ElasticSearch 5 (#101899).

Gentoo platform

• Adjust logcheck rules (#103257, #103117).