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/pretest.dat

@@ -0,0 +1,14 @@
+sun::rm /etc/ipsec.secrets
+sun::tkm_cfgtool -c /etc/tkm/tkm.conf -i /etc/ipsec.conf -t /etc/tkm/tkm.bin -s /usr/local/share/tkm/tkmconfig.xsd
+sun::cat /etc/ipsec.conf
+sun::tkm_keymanager -c /etc/tkm/tkm.bin -k /etc/tkm/sunKey.der -r /etc/tkm/strongswanCert.der >/tmp/tkm.log 2>&1 &
+sun::expect-file /tmp/tkm.rpc.ike
+sun::DAEMON_NAME=charon-tkm ipsec start
+carol::ipsec start
+carol::expect-connection host-host
+dave::ipsec start
+dave::expect-connection host-host
+sun::DAEMON_NAME=charon-tkm expect-connection conn1
+sun::DAEMON_NAME=charon-tkm expect-connection conn2
+carol::ipsec up host-host
+dave::ipsec up host-host