testing: Adapt tests to retransmission settings and reduce DPD delay/timeout

testing/tests/ikev1/rw-initiator-only/hosts/dave/etc/strongswan.conf

@@ -2,8 +2,4 @@
 
 charon {
   load = test-vectors aes des sha1 sha2 md5 pem pkcs1 pkcs8 gmp random nonce x509 curl revocation hmac xcbc cmac ctr ccm gcm stroke kernel-netlink socket-default updown
-
-  retransmit_timeout = 2
-  retransmit_base = 1.5
-  retransmit_tries = 3 
 }