Purge and Recurse should be set together (#399)

If you for whatever reason decide to change the value of purge,
recurse should change with it.

This is nothing new and the solution as it's implemented here is the
same I have seen in other popular modules (saz-sudo, ghoneycutt-ssh)
regarding the relation between purge and recurse. If you don't you
can get unexpected behaviour.

Related to #390

Co-authored-by: okopop <[email protected]>

manifests/server/config.pp

@@ -55,7 +55,7 @@
       group   => 0,
       mode    => $ssh::server::include_dir_mode,
       purge   => $ssh::server::include_dir_purge,
-      recurse => true,
+      recurse => $ssh::server::include_dir_purge,
     }
 
     $ssh::server::config_files.each |$file, $params| {