This test case is an IKEv2 responder for the first SA, which then decides to
rekey the child SA (before the other end).  To simulate behaviour of 
Strongswan, this end is made to send out a CREATE_CHILD_SA message with 
msgid of 0.

This uses the I1/R1/I2/R2/I3 pcap files from lp36 thru lp39.

The output packet of this test will be sent to the next test lp81.  Together
the interaction is intended to look like this:


Initiator                                                             Responder
-------------------------------------------------------------------------------

                              --- 08:39:04 ---

INIT, I, id 0                                                                     <- lp36
[ SA KE No N(NATD_S_IP) N(NATD_D_IP) V ] ----->                                   <- send INIT req

                            INIT, R, id 0                                         <- lp37
                     <----- [ SA KE No N(NATD_S_IP) N(NATD_D_IP) N(MULT_AUTH) ]   <- accept INIT req, send INIT resp

AUTH, I, id 1                                                                     <- lp38
[ IDi AUTH SA TSi TSr ] ----->                                                    <- accept INIT resp, send AUTH req

                                            AUTH, R, id 1                         <- lp39
                                     <----- [ IDr AUTH SA TSi TSr N(AUTH_LFT) ]   <- accept AUTH req, send AUTH resp

                              --- 08:42:06 ---

# NOTE: in the wild, there may have been many successful CREATE CHILD SA exchanges
# initiated by the original Initiator.  This test case emulates a rare condition
# where the original Responder requests a CHILD rekey.

                              --- 08:43:03 ---
                                                                                  <- 
                                                  CREATE_CHILD_SA, id 0           <- lp80
                                           <----- [ N(REKEY_SA) SA No TSi TSr ]   <- state: R2 
                                                                                  <-

                                                                                  <-
CREATE_CHILD_SA, IR, id 0                                                         <- lp81
[ N(REKEY_SA) SA No TSi TSr ] ----->                                              <- state: I3
                                                                                  <-

