Add ITL hostcheck command for sample config.

Fixes #5939

etc/icinga2/conf.d/generic-host.conf

@@ -3,25 +3,7 @@
  * all hosts should import this template.
  */
 template Host "generic-host" {
-  check = "ping4"
-}
-
-apply Service "ping4" {
-  import "generic-service"
-
-  check_command = "ping4"
-
-  assign where "generic-host" in host.templates
-  ignore where !host.vars.address
-}
-
-apply Service "ping6" {
-  import "generic-service"
-
-  check_command = "ping6"
-
-  assign where "generic-host" in host.templates
-  ignore where !host.vars.address6
+  check_command = "hostcheck"
 }
 
 template Host "linux-server" {

itl/command-common.conf

@@ -63,6 +63,16 @@ object CheckCommand "ping6" {
 	vars.timeout = 0
 }
 
+object CheckCommand "hostcheck" {
+	import "ping4"
+
+	vars.wrta = 3000.0,
+	vars.wpl = 80,
+
+	vars.crta = 5000.0,
+	vars.cpl = 100
+}
+
 object CheckCommand "dummy" {
 	import "plugin-check-command",