Add sun.security.action package export to sun.jdk module

An application that uses a simple:
System.getProperty("line.separator");

gets a stacktrace during startup:

0m�[31m11:38:22,418 ERROR [org.apache.catalina.core.ContainerBase.[jboss.web].[default-host].[/ejbca/cmp-tcp]] (ServerService Thread Pool – 64) JBWEB000289: Servlet CmpTcpInitServlet threw load() exception: java.lang.ClassNotFoundException: sun.security.action.GetPropertyAction

The simple solution is to export sun/security/action in modules/system/layers/base/sun/jdk/main/module.xml. Simply add:

<path name="sun/security/action"/>