Add helper script to run all clients

examples/run_all_clients.sh

@@ -0,0 +1,6 @@
+#!/bin/bash
+for i in secure_udp_client.sh secure_dtls_client.sh secure_tcp_client_c2c_tcp_relay.sh  secure_tls_client_c2c_tcp_relay.sh secure_tls_client.sh secure_udp_client.sh secure_sctp_client.sh secure_tcp_client.sh secure_udp_c2c.sh;
+do
+	echo $i
+	./scripts/longtermsecure/$i $@
+done