Implement multiple-clients integration test

Two transport connections to gateway sun are set up, one from client
carol and the other from client dave. The gateway sun uses the Trusted
Key Manager (TKM) and is the responder for both connections. The
authentication is based on X.509 certificates. In order to test the
connections, both carol and dave ping gateway sun.

testing/tests/tkm/multiple-clients/test.conf

@@ -0,0 +1,21 @@
+#!/bin/bash
+#
+# This configuration file provides information on the
+# guest instances used for this test
+
+# All guest instances that are required for this test
+#
+VIRTHOSTS="carol dave sun winnetou"
+
+# Corresponding block diagram
+#
+DIAGRAM="a-m-c-w-d-s.png"
+
+# Guest instances on which tcpdump is to be started
+#
+TCPDUMPHOSTS="carol dave"
+
+# Guest instances on which IPsec is started
+# Used for IPsec logging purposes
+#
+IPSECHOSTS="carol dave sun"