icinga2.conf: Include plugins-contrib, manubulon, windows-plugins, nscp by default

This helps a lot when configuring client checks as command endpoint
where the check command definitions are both used on the master
and the client.

fixes #10722

doc/4-configuring-icinga-2.md

@@ -100,6 +100,9 @@ The `include` directive can be used to include other files.
      */
      include "zones.conf"
 
+The [Icinga Template Library](10-icinga-template-library.md#icinga-template-library) provides a set of common templates
+and [CheckCommand](3-monitoring-basics.md#check-commands) definitions.
+
     /**
      * The Icinga Template Library (ITL) provides a number of useful templates
      * and command definitions.
@@ -107,6 +110,20 @@ The `include` directive can be used to include other files.
      */
     include <itl>
     include <plugins>
+    include <plugins-contrib>
+    include <manubulon>
+
+    /**
+     * This includes the Icinga 2 Windows plugins. These command definitions
+     * are required on a master node when a client is used as command endpoint.
+     */
+    include <windows-plugins>
+
+    /**
+     * This includes the NSClient++ check commands. These command definitions
+     * are required on a master node when a client is used as command endpoint.
+     */
+    include <nscp>
 
     /**
      * The features-available directory contains a number of configuration

etc/icinga2/icinga2.conf

@@ -25,7 +25,20 @@ include "zones.conf"
  */
 include <itl>
 include <plugins>
-// include <plugins-contrib>
+include <plugins-contrib>
+include <manubulon>
+
+/**
+ * This includes the Icinga 2 Windows plugins. These command definitions
+ * are required on a master node when a client is used as command endpoint.
+ */
+include <windows-plugins>
+
+/**
+ * This includes the NSClient++ check commands. These command definitions
+ * are required on a master node when a client is used as command endpoint.
+ */
+include <nscp>
 
 /**
  * The features-available directory contains a number of configuration

etc/icinga2/win32/icinga2.conf

@@ -25,7 +25,8 @@ include "zones.conf"
  */
 include <itl>
 include <plugins>
-// include <plugins-contrib>
+include <plugins-contrib>
+include <manubulon>
 
 /**
  * This includes the Icinga 2 Windows plugins.
@@ -58,4 +59,3 @@ include_recursive "repository.d"
  * directory. Each of these files must have the file extension ".conf".
  */
 include_recursive "conf.d"
-