IKEv2 RW test with ping -f to test packet leak while SAs are replaced 
with rekey=yes on initiator, and rekey=no on the responder.
road ikelifetime 90s. The initiator will replace IKE SA.

1. Road initiates and establish a connection.
2. Initiator keeps the tunnel up.
3. Initiator replace up the tunnel (IKE & ESP) before the expiry of IKE SA.

After the tunnel is up there is a continuous ping in the background 
to test packet leak.  
There is 4 clear text pings and rest should be encrypted.

Test OUTPUT directory will be over 1 GB. So don't add to TESTLIST?
