Several fixes in forwarding strategies and NACK processing

- All strategies will forward to one green face first, if it exists
- Implemented logic to detect retransmitted interests (same face)
- If interest is retransmitted and all faces are exhausted during the
  propagation face, increase max retx counter and try again
- PIT entry lifetime is updated on every non-duplicate interest reception
10 files changed
tree: 204368ca681d72bd75d67ad09b13f967cc6c3836
  1. apps/
  2. bindings/
  3. examples/
  4. helper/
  5. model/
  6. test/
  7. .gitignore
  8. wscript