Missing parameters

  Without those parameters the module don't work under FreeBSD, the file
  'constants.conf' created by the module don't get the PluginDir or
  PluginContribDir, but the standard config for the plugin still get thing like

        command = [ PluginDir + "/check_ping" ]

  so icinga2 won't start because PluginDir/PluginContribDir are unkown

data/FreeBSD-kernel.yaml

@@ -15,3 +15,6 @@ icinga2::globals::spool_dir: /var/spool/icinga2
 icinga2::globals::cache_dir: /var/cache/icinga2
 icinga2::globals::cert_dir: /var/lib/icinga2/certs
 icinga2::globals::ca_dir: /var/lib/icinga2/ca
+icinga2::globals::constants:
+  PluginDir: '/usr/local/libexec/nagios'
+  PluginContribDir: '/usr/local/libexec/nagios'