testing: Avoid delays with ping by using -W and -i options

With -W we reduce timeouts when we don't expect a response.  With -i the
interval between pings is reduced (mostly in case of auto=route where
the first ping yields no reply).

testing/tests/ikev2/rw-eap-sim-radius/evaltest.dat

@@ -12,4 +12,4 @@ moon:: cat /var/log/daemon.log::EAP method EAP_SIM failed for peer dave@strongsw
 moon:: ipsec status 2> /dev/null::rw-eap.*ESTABLISHED.*moon.strongswan.org.*[email protected]::NO
 dave:: cat /var/log/daemon.log::received EAP_FAILURE, EAP authentication failed::YES
 dave:: ipsec status 2> /dev/null::home.*ESTABLISHED::NO
-dave:: ping -c 1 PH_IP_ALICE::64 bytes from PH_IP_ALICE: icmp_req=1::NO
+dave:: ping -c 1 -W 1 PH_IP_ALICE::64 bytes from PH_IP_ALICE: icmp_req=1::NO