netstat: add new module

This can be used to verify that service is correctly listening. The
usage can be either to check that correct service (such as kresd) are
the one binded to port. Other usage is to verify that control socket is
available / is not removed (again for example for kresd).

modules/48_netstat.module

+#!modules/module.sh
+
+help="
+$(gettext "Prints all listening sockets.")
+"
+
+run () {
+	netstat -alpeW
+}
+
+# vim: ft=sh