* fragmentation: Remove spurious Racoon non-ESP marker

During testing we found that racoon sometimes adds a bogus non-esp marker
to the IKE packet. This confuses libreswan, because it causes the ICOOKIE
to not match to an existing state.

We assume now that if the ICOOKIE starts with 00 00 00 00, that it is
such a bogus marker, and we use out_raw() to remove the 4 bytes from
the packet stream. However, it still looks like racoon gets it wrong,
because the ISAKMP header is still not properly formatted.

We're still investigating
* testing: fix north/etc/sysconfig/network-scripts/ifcfg-eth1
* testing: remove default testname so auto naming can happen
* testing: check for north as initiator
* testing: add northnet/northnet-ipv4 to ipsec.common
* testing: add north as initiator in dotest.sh check
* testing: interim fixup for pluto-nat-01
* NAT-T: Added more debugging lines in DBG_NATT category
* testing: update nat-pluto-01 test case

Not fully working yet.