Ticket 47918 - result of dna_dn_is_shared_config is incorrectly used

Bug Description:  dna_load_shared_servers() is called for all entries,
                  except the config entries

Fix Description:   revert the logic of the result of dna_dn_is_shared_config()

https://fedorahosted.org/389/ticket/47918

Reviewed by: Mark, Thanks

ldap/servers/plugins/dna/dna.c

@@ -4163,7 +4163,7 @@ static int dna_config_check_post_op(Slapi_PBlock * pb)
             if (dna_dn_is_config(dn)) {
                 dna_load_plugin_config(pb, 0);
             }
-            if(dna_dn_is_shared_config(pb, dn) == 0){
+            if(dna_dn_is_shared_config(pb, dn)){
                 dna_load_shared_servers();
             }
         }