Suricata

There is some issues in defrag code.

One is an error in Defrag4Reassemble and Defrag6Reassemble which clean the tracker which is used by the calling function.

An other one, is a possible use of invalid data by if two threads are using the same tracker and the first who get the lock on the tracker clean it.

This two bugs implies architecture problem and this part of the code need should be rewritten.