[dispatcher] accept socket defintion with TAG also

Update the regexp to allow TAG instead of IP in the socket definition

(cherry picked from commit cf90fb4)

Author: bogdan-iancu

web/common/forms.php

@@ -505,6 +505,6 @@ function get_combo_options($combo)
 
 $re_ip = "([0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3})";
 
-$re_socket = "^([a-zA-Z]+:)?([0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3})(:[0-9]+)?$";
+$re_socket = "^([a-zA-Z]+:)?(([0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3})|([0-9A-Za-z_])+)(:[0-9]+)?$";
 
 ?>