(legacy) add missing function calls

src/etc/inc/xmlrpc/legacy.inc

@@ -213,6 +213,7 @@ function filter_configure_xmlrpc()
         # twice, as described on ticket #3797
         services_dhcpd_configure();
     }
+    system_hosts_generate();
     local_sync_accounts();
 
     return true;

src/www/services_dhcp.php

@@ -505,6 +505,7 @@ if (isset($_POST['submit']) || isset($_POST['apply'])) {
 	/* Stop DHCP so we can cleanup leases */
 	killbyname("dhcpd");
 	dhcp_clean_leases();
+	system_hosts_generate();
 	/* dnsmasq_configure calls dhcpd_configure */
 	/* no need to restart dhcpd twice */
 	if (isset($config['dnsmasq']['enable']) && isset($config['dnsmasq']['regdhcpstatic']))	{

src/www/system_advanced_admin.php

@@ -269,6 +269,7 @@ if ($_POST) {
         }
 
         setup_serial_port();
+        system_hosts_generate();
         // Restart DNS in case dns rebinding toggled
         if (isset($config['dnsmasq']['enable'])) {
             services_dnsmasq_configure();