Release 2019_015 (2019-06-03)

NixOS 15.09 platform

• Provide OpenSSL and Nix tools to Sensu checks

• Disable failing telegraf service in the boot image (#110845)

NixOS 18.09 platform

• Provide OpenSSL and Nix tools to Sensu checks

• Disable failing Telegraf service in the boot image (#110845)

• Port RabbitMQ roles (versions 3.6.5, 3.6.15), add role for version 3.7.15