config_validate_cmd: Switch datatype to absolute path

Optional doesn't make sense here because we cannot pass undef when the
parameter has a default value. And the resources require an absolute
path.

Author: bastelfreak

REFERENCE.md

@@ -116,7 +116,7 @@ Default value: `'0644'`
 
 ##### <a name="-keepalived--config_validate_cmd"></a>`config_validate_cmd`
 
-Data type: `Variant[String, Undef]`
+Data type: `Stdlib::Absolutepath`
 
 Input for the `validate_cmd` param of the keepalived.conf concat fragment.
 

manifests/init.pp

@@ -66,7 +66,7 @@
   Stdlib::Absolutepath   $config_dir          = '/etc/keepalived',
   Stdlib::Filemode       $config_dir_mode     = '0755',
   Stdlib::Filemode       $config_file_mode    = '0644',
-  Variant[String, Undef] $config_validate_cmd = '/usr/sbin/keepalived -l -t -f %',
+  Stdlib::Absolutepath   $config_validate_cmd = '/usr/sbin/keepalived -l -t -f %',
 
   Array[Stdlib::Absolutepath] $include_external_conf_files = [],