Main configuration handling

[bobapple]

Default configuration files should be configurable based on templates. This affects:

• icinga2.conf
  • include constants
  • include zones.conf
  • include plugins (itl, plugins, plugins-contrib, ...)
  • include features-enabled/*.conf
  • include conf.d directory or alternative
  • manage/create included config directories
• constants.conf
  • add default constants like PluginDir, NodeName etc.
  • add custom constants

Don't touch any other directory or configuration file managed by the Icinga 2 package for now. Files and directories should only be managed by Ansible if necessary.

Take care that the Icinga process is reloaded/restarted after configuration changes.