[nat] Cope with a bad BSC reassigning in use SRC REF

Some closed source BSC like to assign the SRC REF from a
small static pool and might reuses one we have not yet given
up on.
1 file changed
tree: ecd540fe948e565f0bbb21195347f8bfa5963029
  1. hlrsync/
  2. linux-kernel/
  3. openbsc/
  4. wireshark/